APPENDIX A RADIOCARBON ASSAYS

APPENDIX A

RADIOCARBON ASSAYS

FROM: Darden Hood, Director (mailto:mailto:[email protected]) (This is a copy of the letter being mailed. Invoices/receipts follow only by mail.) August 17, 2005 Dr. James Abbott Texas Department of Transportation Cultural Resource Management Environmental Affairs Division 125 East 11th Street Austin, TX 78701 USA RE: Radiocarbon Dating Results For Samples 41WM1126-C2, 41WM1126-C7, 41WM1126-C12, 41WM1126-C13, 41WM1126-C14, 41WM1126-C15, 41WM1126-C21, 41WM1126-C22, 41WM1126-C27, 41WM1126-C29, 41WM1126-S8 Dear Jim: Enclosed are the radiocarbon dating results for 11 samples recently sent to us. They each provided plenty of carbon for accurate measurements and all the analyses went normally. As usual, the method of analysis is listed on the report with the results and calibration data is provided where applicable. As always, no students or intern researchers who would necessarily be distracted with other obligations and priorities were used in the analyses. We analyzed them with the combined attention of our entire professional staff. If you have specific questions about the analyses, please contact us. We are always available to answer your questions. Our invoice is enclosed. Please, forward it to the appropriate officer or send VISA charge authorization. Thank you. As always, if you have any questions or would like to discuss the results, don’t hesitate to contact me. Sincerely,

1

mailto:[email protected]

Dr. James Abbott Report Date: 8/17/2005

Texas Department of Transportation Material Received: 8/2/2005

Sample Data Measured 13C/12C Conventional Radiocarbon Age Ratio Radiocarbon Age(*)

Beta - 207238 1110 +/- 40 BP -25.5 o/oo 1100 +/- 40 BP SAMPLE : 41WM1126-C2 ANALYSIS : AMS-Advance delivery MATERIAL/PRETREATMENT : (charred material): acid/alkali/acid 2 SIGMA CALIBRATION : Cal AD 880 to 1010 (Cal BP 1070 to 940) ____________________________________________________________________________________ Beta - 207239 1150 +/- 40 BP -24.9 o/oo 1150 +/- 40 BP SAMPLE : 41WM1126-C7 ANALYSIS : AMS-Advance delivery MATERIAL/PRETREATMENT : (charred material): acid/alkali/acid 2 SIGMA CALIBRATION : Cal AD 780 to 990 (Cal BP 1170 to 960) ____________________________________________________________________________________ Beta - 207240 2600 +/- 40 BP -27.2 o/oo 2560 +/- 40 BP SAMPLE : 41WM1126-C12 ANALYSIS : AMS-Advance delivery MATERIAL/PRETREATMENT : (charred material): acid/alkali/acid 2 SIGMA CALIBRATION : Cal BC 810 to 760 (Cal BP 2760 to 2710) AND Cal BC 680 to 550 (Cal BP 2630 to 2500) ____________________________________________________________________________________ Beta - 207241 2480 +/- 40 BP -25.1 o/oo 2480 +/- 40 BP SAMPLE : 41WM1126-C13 ANALYSIS : AMS-Advance delivery MATERIAL/PRETREATMENT : (charred material): acid/alkali/acid 2 SIGMA CALIBRATION : Cal BC 790 to 410 (Cal BP 2740 to 2360) ____________________________________________________________________________________ Beta - 207242 2570 +/- 40 BP -26.4 o/oo 2550 +/- 40 BP SAMPLE : 41WM1126-C14 ANALYSIS : AMS-Advance delivery MATERIAL/PRETREATMENT : (charred material): acid/alkali/acid 2 SIGMA CALIBRATION : Cal BC 800 to 750 (Cal BP 2760 to 2700) AND Cal BC 700 to 540 (Cal BP 2650 to 2490) ____________________________________________________________________________________

2



Beta - 207243 2510 +/- 40 BP -24.7 o/oo 2510 +/- 40 BP SAMPLE : 41WM1126-C15 ANALYSIS : AMS-Advance delivery MATERIAL/PRETREATMENT : (charred material): acid/alkali/acid 2 SIGMA CALIBRATION : Cal BC 790 to 500 (Cal BP 2740 to 2450) AND Cal BC 460 to 430 (Cal BP 2410 to 2380) ____________________________________________________________________________________ Beta - 207244 1990 +/- 40 BP -25.4 o/oo 1980 +/- 40 BP SAMPLE : 41WM1126-C21 ANALYSIS : AMS-Advance delivery MATERIAL/PRETREATMENT : (charred material): acid/alkali/acid 2 SIGMA CALIBRATION : Cal BC 50 to Cal AD 100 (Cal BP 2000 to 1860) ____________________________________________________________________________________ Beta - 207245 2010 +/- 40 BP -25.4 o/oo 2000 +/- 40 BP SAMPLE : 41WM1126-C22 ANALYSIS : AMS-Advance delivery MATERIAL/PRETREATMENT : (charred material): acid/alkali/acid 2 SIGMA CALIBRATION : Cal BC 80 to Cal AD 80 (Cal BP 2030 to 1870) ____________________________________________________________________________________ Beta - 207246 2030 +/- 40 BP -26.6 o/oo 2000 +/- 40 BP SAMPLE : 41WM1126-C27 ANALYSIS : AMS-Advance delivery MATERIAL/PRETREATMENT : (charred material): acid/alkali/acid 2 SIGMA CALIBRATION : Cal BC 80 to Cal AD 80 (Cal BP 2030 to 1870) ____________________________________________________________________________________ Beta - 207247 990 +/- 40 BP -25.3 o/oo 990 +/- 40 BP SAMPLE : 41WM1126-C29 ANALYSIS : AMS-Advance delivery MATERIAL/PRETREATMENT : (charred material): acid/alkali/acid 2 SIGMA CALIBRATION : Cal AD 990 to 1160 (Cal BP 960 to 790) ____________________________________________________________________________________

3



Beta - 207248 10650 +/- 60 BP -10.9 o/oo 10880 +/- 60 BP SAMPLE : 41WM1126-S8 ANALYSIS : AMS-Advance delivery MATERIAL/PRETREATMENT : (shell): acid etch 2 SIGMA CALIBRATION : Cal BC 11180 to 10860 (Cal BP 13130 to 12810) AND Cal BC 10780 to 10700 (Cal BP 12730 to 12650) ____________________________________________________________________________________

4

CALIBRATION O F RADIOCARBO N AGE TO CALENDAR YEARS(Variables: C13/C12=-25.5:lab. mult=1)

La borato ry num ber: Beta-2072 38

Conventio nal radiocarbon age: 1100±40 BP2 Sigma calibrated result:

(95% probability)Cal AD 880 to 1010 (Cal BP 1070 to 940 )

In tercep t dataIntercept of radiocarbon age

with calibration curve: Cal AD 970 (Cal BP 980 )1 Sigma calibrated result:

(68% probability)Cal AD 900 to 9 90 (Cal BP 1060 to 96 0)

4 98 5 S.W . 7 4th Co ur t, M iam i, Flor id a 33 15 5 • T el: (3 05 )66 7- 51 67 • F ax: (3 05 )6 63 -09 64 • E-M ail: b eta@r a dio car bo n.co mBeta Ana lytic Radio carbo n Datin g Laboratory

T alma, A . S ., V ogel, J . C., 1993, R adiocarbon 35(2), p317-322A Sim pl ifi ed Approac h to Calibratin g C14 D atesM athe matics

Stui ver, M., e t. a l., 1998, R adiocarbon 40(3), p1041-1083INT CAL 98 Radiocarbon Age C al ibration

Stui ver, M., v an de r Pl icht, H ., 1998, R adi oc arbon 40(3) , pxii -xi iiEditorial Comm entCalibration D atabase

INTC AL 98Database u sed

References:

Rad

ioca

rbon

age

(BP)

9 60

980

1000

1020

1040

1060

1080

1100

1120

1140

1160

1180

1200

1220

Char red m ate rial1240

C a l A D840 860 880 900 920 940 960 980 1000 1020

1100±40 BP

5




(95% probability)Cal AD 780 to 990 (C al BP 1170 to 960)


with calibration curve: Cal AD 890 (Cal BP 106 0)1 Sigma calibrated result:







References:

Rad

ioca

rbon

age

(BP)

1 000

1020

1040

1060

1080

1100

1120

1140

1160

1180

1200

1220

1240

1260


C a l A D760 780 800 820 840 860 880 900 920 940 960 980 1000

1150±40 BP

6



Conventio nal radiocarbon age: 2560±40 BP2 Sigma calibrated results:

(95% probability)Cal BC 810 to 760 (Cal BP 2 760 to 2710) andCal BC 680 to 550 (Cal BP 2 630 to 2500)


with calibration curve: Cal BC 790 (Cal BP 2740 )1 Sigma calibrated result:

(68% probability)Cal BC 800 to 77 0 (Cal BP 2750 to 272 0)






References:

Rad

ioca

rbon

age

(BP)

2 420

2440

2460

2480

2500

2520

2540

2560

2580

2600

2620

2640

2660

2680


C a l B C850 800 750 700 650 600 550 500

2560±40 BP

7




(95% probability)Cal BC 790 to 410 (Cal BP 2 740 to 2360)

In tercep t dataIntercepts of radiocarbon age

with calibration curve: Cal BC 760 (Cal BP 2710 ) andCal BC 680 (Cal BP 2630 ) andCal BC 550 (Cal BP 2500 )

1 Sigma calibrated result:(68% probability)

Cal BC 770 to 52 0 (Cal BP 2720 to 246 0)






References:

Rad

ioca

rbon

age

(BP)

2 340

2360

2380

2400

2420

2440

2460

2480

2500

2520

2540

2560

2580

2600


C a l B C850 800 750 700 650 600 550 500 450 400 350

2480±40 BP

8













References:

Rad

ioca

rbon

age

(BP)

2 400

2420

2440

2460

2480

2500

2520

2540

2560

2580

2600

2620

2640

2660


C a l B C850 800 750 700 650 600 550 500

2550±40 BP

9






with calibration curve: Cal BC 770 (Cal BP 2720 )1 Sigma calibrated results:

(68% probability)Cal BC 780 to 75 0 (Cal BP 2730 to 270 0) andCal BC 700 to 54 0 (Cal BP 2650 to 249 0)






References:

Rad

ioca

rbon

age

(BP)

2 360

2380

2400

2420

2440

2460

2480

2500

2520

2540

2560

2580

2600

2620


C a l B C850 800 750 700 650 600 550 500 450 400 350

2510±40 BP

10




(95% probability)Cal BC 50 to Ca l AD 10 0 (Cal BP 200 0 to 18 60)



(68% probability)Cal BC 30 to Cal AD 70 (Cal BP 1980 to 1880)






References:

Rad

ioca

rbon

age

(BP)

1 840

1860

1880

1900

1920

1940

1960

1980

2000

2020

2040

2060

2080

2100


C a l B C/AD60 40 20 0 20 40 60 80 100 120

1980±40 BP

11




(95% probability)Cal BC 80 to Ca l AD 80 (C al BP 2030 to 187 0)









References:

Rad

ioca

rbon

age

(BP)

1 860

1880

1900

1920

1940

1960

1980

2000

2020

2040

2060

2080

2100

2120


C a l B C/AD100 80 60 40 20 0 20 40 60 80

2000±40 BP

12




(95% probability)Cal BC 80 to Ca l AD 80 (C al BP 2030 to 187 0)









References:

Rad

ioca

rbon

age

(BP)

1 860

1880

1900

1920

1940

1960

1980

2000

2020

2040

2060

2080

2100

2120


C a l B C/AD100 80 60 40 20 0 20 40 60 80

2000±40 BP

13




(95% probability)Cal AD 990 to 1160 (Cal BP 960 to 790)



(68% probability)Cal AD 1010 to 1040 (Cal BP 940 to 9 10)






References:

Rad

ioca

rbon

age

(BP)

8 40

860

880

900

920

940

960

980

1000

1020

1040

1060

1080

1100


C a l A D960 980 1000 1020 1040 1060 1080 1100 1120 1140 1160

990±40 B P

14




(95% probability)Cal BC 11180 to 10860 (C al BP 13130 to 128 10) andCal BC 10780 to 10700 (C al BP 12730 to 126 50)


with calibration curve: Cal BC 10970 (Cal BP 12 920)1 Sigma calibrated results:







References:

Rad

ioca

rbon

age

(BP)

1 0650

10700

10750

10800

10850

10900

10950

11000

11050

She l l11100

Ca l B C11200 11150 11100 11050 11000 10950 10900 10850 10800 10750 10700 10650

10880±60 B P

15

FROM: Darden Hood, Director (mailto:mailto:[email protected]) (This is a copy of the letter being mailed. Invoices/receipts follow only by mail.) April 28, 2006 Dr. James Abbott Texas Department of Transportation Cultural Resource Management Environmental Affairs Division 125 East 11th Street Austin, TX 78701 USA RE: Radiocarbon Dating Results For Samples WM1126-C41, WM1126-C48, WM1126-C60, WM1126-C74, WM1126-C97, WM1126-C128, WM1126-C140, WM1126-C154, WM1126-C162, WM1126-C164, WM1126-C181, WM1126-C189, WM1126-C192, WM1126-C194, WM1126-C196, WM1126-C197 Dear Jim: Enclosed are the radiocarbon dating results for 16 samples recently sent to us. They each provided plenty of carbon for accurate measurements and all the analyses went normally. As usual, the method of analysis is listed on the report with the results and calibration data is provided where applicable. As always, no students or intern researchers who would necessarily be distracted with other obligations and priorities were used in the analyses. We analyzed them with the combined attention of our entire professional staff. If you have specific questions about the analyses, please contact us. We are always available to answer your questions. Our invoice is enclosed. Please, forward it to the appropriate officer or send VISA charge authorization. Thank you. As always, if you have any questions or would like to discuss the results, don’t hesitate to contact me. Sincerely,

16

mailto:[email protected]




Beta - 215911 6760 +/- 50 BP -9.6 o/oo 7010 +/- 50 BP SAMPLE : WM1126-C41 ANALYSIS : AMS-Standard delivery MATERIAL/PRETREATMENT : (shell): acid etch 2 SIGMA CALIBRATION : Cal BC 5990 to 5760 (Cal BP 7940 to 7710) ____________________________________________________________________________________ Beta - 215912 1120 +/- 40 BP -26.5 o/oo 1100 +/- 40 BP SAMPLE : WM1126-C48 ANALYSIS : AMS-Standard delivery MATERIAL/PRETREATMENT : (charred material): acid/alkali/acid 2 SIGMA CALIBRATION : Cal AD 880 to 1010 (Cal BP 1070 to 940) ____________________________________________________________________________________ Beta - 215913 1560 +/- 40 BP -25.8 o/oo 1550 +/- 40 BP SAMPLE : WM1126-C60 ANALYSIS : AMS-Standard delivery MATERIAL/PRETREATMENT : (charred material): acid/alkali/acid 2 SIGMA CALIBRATION : Cal AD 420 to 610 (Cal BP 1530 to 1340) ____________________________________________________________________________________ Beta - 215914 1170 +/- 40 BP -25.0 o/oo 1170 +/- 40 BP SAMPLE : WM1126-C74 ANALYSIS : AMS-Standard delivery MATERIAL/PRETREATMENT : (charred material): acid/alkali/acid 2 SIGMA CALIBRATION : Cal AD 770 to 980 (Cal BP 1180 to 970) ____________________________________________________________________________________ Beta - 215915 990 +/- 40 BP -25.6 o/oo 980 +/- 40 BP SAMPLE : WM1126-C97 ANALYSIS : AMS-Standard delivery MATERIAL/PRETREATMENT : (charred material): acid/alkali/acid 2 SIGMA CALIBRATION : Cal AD 990 to 1160 (Cal BP 960 to 790) ____________________________________________________________________________________

17



Beta - 215916 2490 +/- 40 BP -26.8 o/oo 2460 +/- 40 BP SAMPLE : WM1126-C128 ANALYSIS : AMS-Standard delivery MATERIAL/PRETREATMENT : (charred material): acid/alkali/acid 2 SIGMA CALIBRATION : Cal BC 780 to 410 (Cal BP 2730 to 2360) ____________________________________________________________________________________ Beta - 215917 2200 +/- 40 BP -25.5 o/oo 2190 +/- 40 BP SAMPLE : WM1126-C140 ANALYSIS : AMS-Standard delivery MATERIAL/PRETREATMENT : (charred material): acid/alkali/acid 2 SIGMA CALIBRATION : Cal BC 380 to 160 (Cal BP 2330 to 2100) ____________________________________________________________________________________ Beta - 215918 2460 +/- 50 BP -26.6 o/oo 2430 +/- 50 BP SAMPLE : WM1126-C154 ANALYSIS : AMS-Standard delivery MATERIAL/PRETREATMENT : (charred material): acid/alkali/acid 2 SIGMA CALIBRATION : Cal BC 780 to 390 (Cal BP 2730 to 2340) ____________________________________________________________________________________ Beta - 215919 2110 +/- 40 BP -26.1 o/oo 2090 +/- 40 BP SAMPLE : WM1126-C162 ANALYSIS : AMS-Standard delivery MATERIAL/PRETREATMENT : (charred material): acid/alkali/acid 2 SIGMA CALIBRATION : Cal BC 200 to 10 (Cal BP 2150 to 1960) ____________________________________________________________________________________ Beta - 215920 2590 +/- 40 BP -25.3 o/oo 2590 +/- 40 BP SAMPLE : WM1126-C164 ANALYSIS : AMS-Standard delivery MATERIAL/PRETREATMENT : (charred material): acid/alkali/acid 2 SIGMA CALIBRATION : Cal BC 820 to 770 (Cal BP 2770 to 2720) ____________________________________________________________________________________

18



Beta - 215921 2070 +/- 40 BP -25.1 o/oo 2070 +/- 40 BP SAMPLE : WM1126-C181 ANALYSIS : AMS-Standard delivery MATERIAL/PRETREATMENT : (charred material): acid/alkali/acid 2 SIGMA CALIBRATION : Cal BC 190 to Cal AD 20 (Cal BP 2140 to 1930) ____________________________________________________________________________________ Beta - 215922 2400 +/- 40 BP -26.8 o/oo 2370 +/- 40 BP SAMPLE : WM1126-C189 ANALYSIS : AMS-Standard delivery MATERIAL/PRETREATMENT : (charred material): acid/alkali/acid 2 SIGMA CALIBRATION : Cal BC 520 to 380 (Cal BP 2470 to 2330) ____________________________________________________________________________________ Beta - 215923 3370 +/- 40 BP -10.7 o/oo 3600 +/- 40 BP SAMPLE : WM1126-C192 ANALYSIS : AMS-Standard delivery MATERIAL/PRETREATMENT : (shell): acid etch 2 SIGMA CALIBRATION : Cal BC 2040 to 1880 (Cal BP 3990 to 3830) ____________________________________________________________________________________ Beta - 215925 4220 +/- 50 BP -7.6 o/oo 4510 +/- 50 BP SAMPLE : WM1126-C194 ANALYSIS : AMS-Standard delivery MATERIAL/PRETREATMENT : (shell): acid etch 2 SIGMA CALIBRATION : Cal BC 3360 to 3020 (Cal BP 5310 to 4970) ____________________________________________________________________________________ Beta - 215926 4170 +/- 50 BP -20.7 o/oo 4240 +/- 50 BP SAMPLE : WM1126-C196 ANALYSIS : AMS-Standard delivery MATERIAL/PRETREATMENT : (organic sediment): acid washes 2 SIGMA CALIBRATION : Cal BC 2920 to 2850 (Cal BP 4860 to 4800) AND Cal BC 2820 to 2680 (Cal BP 4770 to 4630) ____________________________________________________________________________________

19



Beta - 215927 4160 +/- 50 BP -20.6 o/oo 4230 +/- 50 BP SAMPLE : WM1126-C197 ANALYSIS : AMS-Standard delivery MATERIAL/PRETREATMENT : (organic sediment): acid washes 2 SIGMA CALIBRATION : Cal BC 2910 to 2850 (Cal BP 4860 to 4800) AND Cal BC 2820 to 2670 (Cal BP 4770 to 4620) ____________________________________________________________________________________

20

CALIBRATION O F RADIOCARBO N AGE TO CALENDAR YEARS(Variables: C13/C12=-9.6:lab. mu lt=1)



(95% probability)Cal BC 5990 to 5760 (C al BP 7940 to 7710)









References:

Rad

ioca

rbon

age

(BP)

6 800

6850

6900

6950

7000

7050

7100

7150

She l l7200

C a l B C6000 5980 5960 5940 5920 5900 5880 5860 5840 5820 5800 5780 5760 5740

7010±50 BP

21




(95% probability)Cal AD 880 to 1010 (Cal BP 1070 to 940 )









References:

Rad

ioca

rbon

age

(BP)

9 60

980

1000

1020

1040

1060

1080

1100

1120

1140

1160

1180

1200

1220


C a l A D840 860 880 900 920 940 960 980 1000 1020

1100±40 BP

22




(95% probability)Cal AD 420 to 610 (C al BP 1530 to 1340 )









References:

Rad

ioca

rbon

age

(BP)

1 400

1420

1440

1460

1480

1500

1520

1540

1560

1580

1600

1620

1640

1660


C a l A D380 400 420 440 460 480 500 520 540 560 580 600 620

1550±40 BP

23

CALIBRATION O F RADIOCARBO N AGE TO CALENDAR YEARS(Variables: C13/C12=-25:lab. mult=1 )



(95% probability)Cal AD 770 to 980 (C al BP 1180 to 970)









References:

Rad

ioca

rbon

age

(BP)

1 020

1040

1060

1080

1100

1120

1140

1160

1180

1200

1220

1240

1260

1280


C a l A D740 760 780 800 820 840 860 880 900 920 940 960 980

1170±40 BP

24




(95% probability)Cal AD 990 to 1160 (Cal BP 960 to 790)



(68% probability)Cal AD 1010 to 1040 (Cal BP 940 to 9 10)






References:

Rad

ioca

rbon

age

(BP)

8 40

860

880

900

920

940

960

980

1000

1020

1040

1060

1080

1100


C a l A D960 980 1000 1020 1040 1060 1080 1100 1120 1140 1160 1180

980±40 B P

25







1 Sigma calibrated results:(68% probability)

Cal BC 760 to 62 0 (Cal BP 2710 to 256 0) andCal BC 590 to 42 0 (Cal BP 2540 to 237 0)






References:

Rad

ioca

rbon

age

(BP)

2 320

2340

2360

2380

2400

2420

2440

2460

2480

2500

2520

2540

2560

2580


C a l B C800 750 700 650 600 550 500 450 400 350

2460±40 BP

26














References:

Rad

ioca

rbon

age

(BP)

2 040

2060

2080

2100

2120

2140

2160

2180

2200

2220

2240

2260

2280

2300


C a l B C400 380 360 340 320 300 280 260 240 220 200 180 160 140 120

2190±40 BP

27














References:

Rad

ioca

rbon

age

(BP)

2 200

2250

2300

2350

2400

2450

2500

2550


C a l B C800 750 700 650 600 550 500 450 400 350

2430±50 BP

28




(95% probability)Cal BC 200 to 10 (Cal BP 21 50 to 1 960)



(68% probability)Cal BC 170 to 50 (Cal BP 2 120 to 2000 )






References:

Rad

ioca

rbon

age

(BP)

1 940

1960

1980

2000

2020

2040

2060

2080

2100

2120

2140

2160

2180

2200


C a l B C/AD220 200 180 160 140 120 100 80 60 40 20 0 20

2090±40 BP

29













References:

Rad

ioca

rbon

age

(BP)

2 440

2460

2480

2500

2520

2540

2560

2580

2600

2620

2640

2660

2680

2700


C a l B C820 815 810 805 800 795 790 785 780 775 770 765

2590±40 BP

30




(95% probability)Cal BC 190 to C al AD 2 0 (Cal BP 214 0 to 19 30)


with calibration curve: Cal BC 60 (Cal BP 2010)1 Sigma calibrated result:

(68% probability)Cal BC 160 to 40 (Cal BP 2 100 to 1990 )






References:

Rad

ioca

rbon

age

(BP)

1 920

1940

1960

1980

2000

2020

2040

2060

2080

2100

2120

2140

2160

2180


C a l B C/AD200 180 160 140 120 100 80 60 40 20 0 20

2070±40 BP

31













References:

Rad

ioca

rbon

age

(BP)

2 220

2240

2260

2280

2300

2320

2340

2360

2380

2400

2420

2440

2460

2480


C a l B C540 520 500 480 460 440 420 400 380 360

2370±40 BP

32






with calibration curve: Cal BC 1940 (Cal BP 390 0)1 Sigma calibrated result:







References:

Rad

ioca

rbon

age

(BP)

3 460

3480

3500

3520

3540

3560

3580

3600

3620

3640

3660

3680

3700

3720

She l l3740

C a l B C2060 2040 2020 2000 1980 1960 1940 1920 1900 1880 1860

3600±40 BP

33

CALIBRATION O F RADIOCARBO N AGE TO CALENDAR YEARS(Variables: C13/C12=-7.6:lab. mu lt=1)





with calibration curve: Cal BC 3330 (Cal BP 528 0) andCal BC 3220 (Cal BP 517 0) andCal BC 3180 (Cal BP 513 0) andCal BC 3160 (Cal BP 510 0) andCal BC 3130 (Cal BP 508 0)

1 Sigma calibrated result:(68% probability)

Cal BC 3350 to 3 100 (Cal BP 5300 to 5 050)






References:

Rad

ioca

rbon

age

(BP)

4 300

4350

4400

4450

4500

4550

4600

4650

She l l4700

C a l B C3400 3350 3300 3250 3200 3150 3100 3050 3000 2950

4510±50 BP

34




(95% probability)Cal BC 2920 to 2850 (C al BP 4860 to 4800) andCal BC 2820 to 2680 (C al BP 4770 to 4630)


with calibration curve: Cal BC 2880 (Cal BP 483 0)1 Sigma calibrated result:







References:

Rad

ioca

rbon

age

(BP)

4 000

4050

4100

4150

4200

4250

4300

4350

Organ ic sed im en t4400

C a l B C2940 2920 2900 2880 2860 2840 2820 2800 2780 2760 2740 2720 2700 2680 2660

4240±50 BP

35




(95% probability)Cal BC 2910 to 2850 (C al BP 4860 to 4800) andCal BC 2820 to 2670 (C al BP 4770 to 4620)









References:

Rad

ioca

rbon

age

(BP)

4 000

4050

4100

4150

4200

4250

4300

4350

Organ ic sed im en t4400

C a l B C2920 2900 2880 2860 2840 2820 2800 2780 2760 2740 2720 2700 2680 2660

4230±50 BP

36

Digital signature on file

November 21, 2008

Dr. James AbbottTexas Department of TransportationCultural Resource ManagementEnvironmental Affairs Division125 East 11th StreetAustin, TX 78701

RE: Radiocarbon Dating Results For Samples WM1126-C44, WM1126-C45, WM1126-C46, WM1126-C47, WM1126-C53, WM1126-C56, WM1126-C67, WM1126-C68, WM1126-C72, WM1126-C75,WM1126-C83, WM1126-C91, WM1126-C98, WM1126-C107, WM1126-C110, WM1126-C114,WM1126-C116, WM1126-C118, WM1126-C121, WM1126-C129, WM1126-C133, WM1126-C138,WM1126-C144, WM1126-C149, WM1126-C152, WM1126-C161, WM1126-C163, WM1126-C172,WM1126-C173, WM1126-C174, WM1126-C180, WM1126-C187, WM1126-C191

Dear Jim:

Enclosed are the radiocarbon dating results for 33 samples recently sent to us. They eachprovided plenty of carbon for accurate measurements and all the analyses proceeded normally. As usual,the method of analysis is listed on the report with the results and calibration data is provided whereapplicable.

Note that one of the samples (WM1126-C121, Beta-250567) does not have a MeasuredRadiocarbon Age and 13C/12C Ratio reported. This is because the sample was too small to do a separate13C/12C ratio and AMS analysis. The only available 13C/12C ratio available to calculate a ConventionalRadiocarbon Age was that determined on a small aliquot of graphite. Although this ratio corrects to theappropriate Conventional Radiocarbon Age, it is not reported since it includes laboratory chemical anddetector induced fractionation.

As always, no students or intern researchers who would necessarily be distracted with otherobligations and priorities were used in the analyses. We analyzed them with the combined attention ofour entire professional staff.

If you have specific questions about the analyses, please contact us. We are always available toanswer your questions.

Our invoice is enclosed. Please, forward it to the appropriate officer or send VISA chargeauthorization. Thank you. As always, if you have any questions or would like to discuss the results,don’t hesitate to contact me.

Sincerely,

37



Sample Data Measured 13C/12C ConventionalRadiocarbon Age Ratio Radiocarbon Age(*)

Beta - 250549 1040 +/- 40 BP -25.4 o/oo 1030 +/- 40 BPSAMPLE : WM1126-C44ANALYSIS : AMS-Standard deliveryMATERIAL/PRETREATMENT : (charred material): acid/alkali/acid2 SIGMA CALIBRATION : Cal AD 900 to 920 (Cal BP 1050 to 1040) AND Cal AD 960 to 1040 (Cal BP 990 to 910)____________________________________________________________________________________

Beta - 250550 1100 +/- 40 BP -24.5 o/oo 1110 +/- 40 BPSAMPLE : WM1126-C45ANALYSIS : AMS-Standard deliveryMATERIAL/PRETREATMENT : (charred material): acid/alkali/acid2 SIGMA CALIBRATION : Cal AD 870 to 1010 (Cal BP 1080 to 940)____________________________________________________________________________________


Beta - 250552 1050 +/- 40 BP -25.4 o/oo 1040 +/- 40 BPSAMPLE : WM1126-C47ANALYSIS : AMS-Standard deliveryMATERIAL/PRETREATMENT : (charred material): acid/alkali/acid2 SIGMA CALIBRATION : Cal AD 900 to 920 (Cal BP 1050 to 1030) AND Cal AD 950 to 1040 (Cal BP 1000 to 920)____________________________________________________________________________________


38




Beta - 250555 1170 +/- 40 BP -23.9 o/oo 1190 +/- 40 BPSAMPLE : WM1126-C67ANALYSIS : AMS-Standard deliveryMATERIAL/PRETREATMENT : (charred material): acid/alkali/acid2 SIGMA CALIBRATION : Cal AD 710 to 750 (Cal BP 1240 to 1200) AND Cal AD 760 to 900 (Cal BP 1190 to 1050)

Cal AD 920 to 960 (Cal BP 1040 to 990)____________________________________________________________________________________

Beta - 250556 1970 +/- 40 BP -25.1 o/oo 1970 +/- 40 BPSAMPLE : WM1126-C68ANALYSIS : AMS-Standard deliveryMATERIAL/PRETREATMENT : (charred material): acid/alkali/acid2 SIGMA CALIBRATION : Cal BC 50 to Cal AD 120 (Cal BP 2000 to 1830)____________________________________________________________________________________



39





Beta - 250561 2210 +/- 40 BP -26.9 o/oo 2180 +/- 40 BPSAMPLE : WM1126-C98ANALYSIS : AMS-Standard deliveryMATERIAL/PRETREATMENT : (charred material): acid/alkali/acid2 SIGMA CALIBRATION : Cal BC 370 to 150 (Cal BP 2320 to 2100) AND Cal BC 140 to 110 (Cal BP 2090 to 2060)____________________________________________________________________________________



40



Beta - 250564 2330 +/- 40 BP -24.7 o/oo 2330 +/- 40 BPSAMPLE : WM1126-C114ANALYSIS : AMS-Standard deliveryMATERIAL/PRETREATMENT : (charred material): acid/alkali/acid2 SIGMA CALIBRATION : Cal BC 410 to 370 (Cal BP 2360 to 2320)____________________________________________________________________________________


Beta - 250566 1900 +/- 40 BP -26.2 o/oo 1880 +/- 40 BPSAMPLE : WM1126-C118ANALYSIS : AMS-Standard deliveryMATERIAL/PRETREATMENT : (charred material): acid/alkali/acid2 SIGMA CALIBRATION : Cal AD 50 to 230 (Cal BP 1900 to 1720)____________________________________________________________________________________Beta - 250567 NA NA 2470 +/- 40 BPSAMPLE : WM1126-C121ANALYSIS : AMS-Standard deliveryMATERIAL/PRETREATMENT : (burned bone organics): acid/alkali/acid2 SIGMA CALIBRATION : Cal BC 780 to 410 (Cal BP 2730 to 2360)COMMENT: the original sample was too small for a 13C/12C ratio measurement. However, a ratio including both natural andlaboratory effects was measured during the 14C detection to derive a Conventional Radiocarbon Age, suitable for applicable calendarcalibration.____________________________________________________________________________________

Beta - 250568 2490 +/- 40 BP -25.1 o/oo 2490 +/- 40 BPSAMPLE : WM1126-C129ANALYSIS : AMS-Standard deliveryMATERIAL/PRETREATMENT : (charred material): acid/alkali/acid2 SIGMA CALIBRATION : Cal BC 780 to 410 (Cal BP 2740 to 2360)

41








42








43






44

C ALIBR ATIO N OF R AD IO CAR B ON AGE TO CA LEND AR Y EARS(Variable s: C 13/C 12=-25.4 :lab. m ult=1)

L ab ora tor y n um ber : Beta-25054 9

C onventional radiocar bon a ge: 1030±40 BP

2 S igm a calib rated results:(95% p r obab ility )

C al A D 900 to 920 (C al BP 105 0 to 1040) a ndC al A D 960 to 1040 (Cal BP 99 0 to 910)

Intercept data

Intercep t of rad iocarbon agew ith c alibration curve: Cal AD 1010 (Ca l B P 940 )

1 S igm a ca libra ted re sult:(68% probability)

Cal AD 980 to 1030 (C al BP 960 to 92 0)

4985 S.W. 74th Court, Miami, Florida 33155 • Te l: (305)667-5167 • Fax: ( 305)663-0964 • E-Mail: beta@ radiocarbon.c om

B eta A nalytic R adiocarbon D ating Laboratory

Ta lma , A . S ., Vo gel, J . C., 1 99 3, Ra diocar bon 35(2) , p 317 -3 22A Simplif ied App roa ch to Ca libra ting C14 D a tesMa them atics

IntCa l04 : Calib ratio n Iss ue o f Ra diocar bon (V olum e 4 6, nr 3, 20 04) .IN TCAL 04 R adio ca rbo n Age C alibr ationCalib ratio n D ata ba se

INTCA L04Da tab ase used

R eference s:

Rad

ioca

rbon

age

(BP

)

8 80

9 00

9 20

9 40

9 60

9 80

1 000

1 020

1 040

1 060

1 080

1 100

1 120

1 140

Ch arred m aterial1 160

Cal AD880 90 0 920 94 0 960 98 0 1 000 10 20 1 040 1060

103 0±40 B P

45




2 S igm a calib rated resu lt:(95% p r obab ility )

C al A D 870 to 1010 (Cal BP 10 80 to 940)

Intercept data

Intercep ts of radioc arbon a gew ith c alibration curve: Cal AD 900 (Ca l B P 1050 ) and

Cal AD 920 (Ca l B P 1040 ) andCal AD 960 (Ca l B P 990)


Cal AD 890 to 980 (C al BP 1060 to 96 0)






R eference s:

Rad

ioca

rbon

age

(BP

)

9 60

9 80

1 000

1 020

1 040

1 060

1 080

1 100

1 120

1 140

1 160

1 180

1 200

1 220


Cal AD840 86 0 880 90 0 920 94 0 9 60 98 0 1 000 1020

111 0±40 B P

46





C al A D 810 to 1010 (Cal BP 11 40 to 940)

Intercept data


Cal AD 920 (Ca l B P 1030 ) andCal AD 950 (Ca l B P 1000 )


Cal AD 890 to 980 (C al BP 1060 to 97 0)






R eference s:

Rad

ioca

rbon

age

(BP

)

9 80

1 000

1 020

1 040

1 060

1 080

1 100

1 120

1 140

1 160

1 180

1 200

1 220

1 240


Cal AD780 8 00 820 84 0 8 60 880 9 00 920 94 0 9 60 980 10 00 1020

112 0±40 B P

47





C al A D 900 to 920 (C al BP 105 0 to 1030) a ndC al A D 950 to 1040 (Cal BP 10 00 to 920)

Intercept data



Cal AD 980 to 1020 (C al BP 970 to 93 0)






R eference s:

Rad

ioca

rbon

age

(BP

)

9 00

9 20

9 40

9 60

9 80

1 000

1 020

1 040

1 060

1 080

1 100

1 120

1 140

1 160


Cal AD860 88 0 900 92 0 940 96 0 9 80 10 00 1 020 1040

104 0±40 B P

48





C al A D 230 to 410 (C al BP 172 0 to 1540)

Intercept data




Cal AD 250 to 380 (C al BP 1700 to 15 70)






R eference s:

Rad

ioca

rbon

age

(BP

)

1 580

1 600

1 620

1 640

1 660

1 680

1 700

1 720

1 740

1 760

1 780

1 800

1 820

1 840


Cal AD200 220 2 40 260 280 30 0 32 0 3 40 360 380 40 0 420

173 0±40 B P

49





C al A D 780 to 1000 (Cal BP 11 60 to 950)

Intercept data



Cal AD 880 to 980 (C al BP 1070 to 97 0)






R eference s:

Rad

ioca

rbon

age

(BP

)

9 80

1 000

1 020

1 040

1 060

1 080

1 100

1 120

1 140

1 160

1 180

1 200

1 220

1 240


Cal AD760 78 0 80 0 82 0 8 40 860 880 900 920 94 0 9 60 9 80 1 000 1020

113 0±40 B P

50





C al A D 710 to 750 (C al BP 124 0 to 1200) a ndC al A D 760 to 900 (C al BP 119 0 to 1050) a ndC al A D 920 to 960 (C al BP 104 0 to 990)

Intercept data



Cal AD 780 to 890 (C al BP 1170 to 10 60)






R eference s:

Rad

ioca

rbon

age

(BP

)

1 040

1 060

1 080

1 100

1 120

1 140

1 160

1 180

1 200

1 220

1 240

1 260

1 280

1 300


Cal AD650 700 7 50 80 0 850 900 9 50 1000

119 0±40 B P

51





C al BC 50 to C al A D 120 (C al B P 2000 to 18 30)

Intercept data

Intercep t of rad iocarbon agew ith c alibration curve: Cal AD 30 (Cal BP 1920)


Cal BC 10 to Cal AD 70 (Cal BP 1960 to 1880)






R eference s:

Rad

ioca

rbon

age

(BP

)

1 820

1 840

1 860

1 880

1 900

1 920

1 940

1 960

1 980

2 000

2 020

2 040

2 060

2 080


Cal BC/AD60 40 20 0 20 40 60 80 100 1 20 140

197 0±40 B P

52





C al A D 660 to 880 (C al BP 128 0 to 1070)

Intercept data




Cal AD 680 to 780 (C al BP 1270 to 11 70)






R eference s:

Rad

ioca

rbon

age

(BP

)

1 120

1 140

1 160

1 180

1 200

1 220

1 240

1 260

1 280

1 300

1 320

1 340

1 360

1 380


Cal AD640 66 0 68 0 70 0 7 20 740 760 780 800 82 0 8 40 8 60 8 80 900

126 0±40 B P

53





C al A D 30 to 230 (C al B P 1920 to 1720)

Intercept data



Cal AD 70 to 140 (C al BP 1880 to 181 0)






R eference s:

Rad

ioca

rbon

age

(BP

)

1 740

1 760

1 780

1 800

1 820

1 840

1 860

1 880

1 900

1 920

1 940

1 960

1 980

2 000


Cal BC/AD0 2 0 40 60 8 0 100 1 20 140 16 0 1 80 200 22 0 240

189 0±40 B P

54





C al A D 20 to 220 (C al B P 1930 to 1730)

Intercept data



Cal AD 60 to 130 (C al BP 1880 to 182 0)






R eference s:

Rad

ioca

rbon

age

(BP

)

1 760

1 780

1 800

1 820

1 840

1 860

1 880

1 900

1 920

1 940

1 960

1 980

2 000

2 020


Cal BC/AD0 2 0 40 60 8 0 100 1 20 140 16 0 1 80 200 22 0 240

190 0±40 B P

55





C al A D 880 to 1020 (Cal BP 10 70 to 930)

Intercept data

Intercep t of rad iocarbon agew ith c alibration curve: Cal AD 980 (Ca l B P 970)


Cal AD 900 to 1000 (C al BP 1050 to 9 50)






R eference s:

Rad

ioca

rbon

age

(BP

)

9 40

9 60

9 80

1 000

1 020

1 040

1 060

1 080

1 100

1 120

1 140

1 160

1 180

1 200


Cal AD860 88 0 900 92 0 940 96 0 9 80 10 00 1 020 1040

109 0±40 B P

56





C al BC 370 to 15 0 (Cal BP 2 320 to 2100) andC al BC 140 to 11 0 (Cal BP 2 090 to 2060)

Intercept data

Intercep ts of radioc arbon a gew ith c alibration curve: Cal BC 340 (C al BP 2 290) an d

Cal BC 330 (C al BP 2 280) an dCal BC 200 (C al BP 2 150)

1 S igm a ca libra ted re sults :(68% probability)

Cal BC 360 to 290 (Ca l B P 2300 to 2240) andCal BC 240 to 180 (Ca l B P 2180 to 2130)






R eference s:

Rad

ioca

rbon

age

(BP

)

2 040

2 060

2 080

2 100

2 120

2 140

2 160

2 180

2 200

2 220

2 240

2 260

2 280

2 300


Cal BC400 350 3 00 25 0 200 150 1 00 50

218 0±40 B P

57






Intercept data

Intercep t of rad iocarbon agew ith c alibration curve: Cal BC 790 (C al BP 2 740)


Cal BC 800 to 780 (Ca l B P 2750 to 2730)






R eference s:

Rad

ioca

rbon

age

(BP

)

2 440

2 460

2 480

2 500

2 520

2 540

2 560

2 580

2 600

2 620

2 640

2 660

2 680

2 700


Cal BC820 80 0 780 76 0 740 72 0 7 00 68 0 6 60 640

259 0±40 B P

58






Intercept data









R eference s:

Rad

ioca

rbon

age

(BP

)

2 120

2 140

2 160

2 180

2 200

2 220

2 240

2 260

2 280

2 300

2 320

2 340

2 360

2 380


Cal BC420 4 00 380 36 0 3 40 320 3 00 280 26 0 2 40 220 20 0 180

227 0±40 B P

59





C al BC 410 to 37 0 (Cal BP 2 360 to 2320)

Intercept data



Cal BC 400 to 390 (Ca l B P 2350 to 2340)






R eference s:

Rad

ioca

rbon

age

(BP

)

2 180

2 200

2 220

2 240

2 260

2 280

2 300

2 320

2 340

2 360

2 380

2 400

2 420

2 440


Cal BC420 415 410 4 05 4 00 39 5 39 0 38 5 380 375 3 70 3 65 360

233 0±40 B P

60





C al BC 50 to C al A D 120 (C al B P 2000 to 18 30)

Intercept data



Cal BC 10 to Cal AD 70 (Cal BP 1960 to 1880)






R eference s:

Rad

ioca

rbon

age

(BP

)

1 820

1 840

1 860

1 880

1 900

1 920

1 940

1 960

1 980

2 000

2 020

2 040

2 060

2 080


Cal BC/AD60 40 20 0 20 40 60 80 100 1 20 140

197 0±40 B P

61





C al A D 50 to 230 (C al B P 1900 to 1720)

Intercept data



Cal AD 80 to 140 (C al BP 1870 to 181 0)






R eference s:

Rad

ioca

rbon

age

(BP

)

1 740

1 760

1 780

1 800

1 820

1 840

1 860

1 880

1 900

1 920

1 940

1 960

1 980

2 000


Cal AD20 40 6 0 80 100 12 0 14 0 1 60 180 200 22 0 240

188 0±40 B P

62

C ALIBR ATIO N OF R AD IO CAR B ON AGE TO CA LEND AR Y EARS(Variable s: C 13/C 12=N/A:la b. m ult=1)




C al BC 780 to 41 0 (Cal BP 2 730 to 2360)

Intercept data










R eference s:

Rad

ioca

rbon

age

(BP

)

2 320

2 340

2 360

2 380

2 400

2 420

2 440

2 460

2 480

2 500

2 520

2 540

2 560

2 580

burne d bon e o rgan ics2 600

Cal BC800 750 70 0 650 6 00 550 500 4 50 400 350

247 0±40 B P

63





C al BC 780 to 41 0 (Cal BP 2 740 to 2360)

Intercept data


Cal BC 690 (C al BP 2 640) an dCal BC 660 (C al BP 2 610) an dCal BC 640 (C al BP 2 590) an dCal BC 590 (C al BP 2 540)


Cal BC 760 to 530 (Ca l B P 2720 to 2480)






R eference s:

Rad

ioca

rbon

age

(BP

)

2 340

2 360

2 380

2 400

2 420

2 440

2 460

2 480

2 500

2 520

2 540

2 560

2 580

2 600


Cal BC850 800 750 700 650 600 550 500 450 400 350

249 0±40 B P

64





C al A D 80 to 340 (C al B P 1870 to 1610)

Intercept data



Cal AD 130 to 250 (C al BP 1820 to 17 00)






R eference s:

Rad

ioca

rbon

age

(BP

)

1 600

1 650

1 700

1 750

1 800

1 850

1 900

1 950


Cal AD0 50 1 00 15 0 200 250 3 00 350

181 0±50 B P

65





C al BC 820 to 76 0 (Cal BP 2 770 to 2710)

Intercept data



Cal BC 800 to 780 (Ca l B P 2750 to 2730)






R eference s:

Rad

ioca

rbon

age

(BP

)

2 460

2 480

2 500

2 520

2 540

2 560

2 580

2 600

2 620

2 640

2 660

2 680

2 700

2 720


Cal BC825 820 81 5 810 805 8 00 79 5 790 7 85 78 0 775 7 70 76 5 760

260 0±40 B P

66






Intercept data



Cal BC 400 to 380 (Ca l B P 2350 to 2330)






R eference s:

Rad

ioca

rbon

age

(BP

)

2 160

2 180

2 200

2 220

2 240

2 260

2 280

2 300

2 320

2 340

2 360

2 380

2 400

2 420


Cal BC420 40 0 380 36 0 340 32 0 3 00 28 0 2 60 240

231 0±40 B P

67





C al BC 780 to 41 0 (Cal BP 2 730 to 2360)

Intercept data


Cal BC 690 (C al BP 2 640) an dCal BC 660 (C al BP 2 610) an dCal BC 640 (C al BP 2 590) an dCal BC 550 (C al BP 2 500)


Cal BC 760 to 520 (Ca l B P 2710 to 2470)






R eference s:

Rad

ioca

rbon

age

(BP

)

2 340

2 360

2 380

2 400

2 420

2 440

2 460

2 480

2 500

2 520

2 540

2 560

2 580

2 600


Cal BC800 750 70 0 650 6 00 550 500 4 50 400 350

248 0±40 B P

68






Intercept data









R eference s:

Rad

ioca

rbon

age

(BP

)

2 120

2 140

2 160

2 180

2 200

2 220

2 240

2 260

2 280

2 300

2 320

2 340

2 360

2 380


Cal BC420 4 00 380 36 0 3 40 320 3 00 280 26 0 2 40 220 20 0 180

226 0±40 B P

69





C al BC 820 to 76 0 (Cal BP 2 770 to 2720)

Intercept data



Cal BC 810 to 780 (Ca l B P 2760 to 2740)






R eference s:

Rad

ioca

rbon

age

(BP

)

2 460

2 480

2 500

2 520

2 540

2 560

2 580

2 600

2 620

2 640

2 660

2 680

2 700

2 720


Cal BC830 825 820 815 810 805 800 795 790 785 780 775 7 70 7 65 760

261 0±40 B P

70






Intercept data










R eference s:

Rad

ioca

rbon

age

(BP

)

2 040

2 060

2 080

2 100

2 120

2 140

2 160

2 180

2 200

2 220

2 240

2 260

2 280

2 300


Cal BC400 350 3 00 25 0 200 150 1 00 50

218 0±40 B P

71






Intercept data



Cal BC 510 to 400 (Ca l B P 2460 to 2350)






R eference s:

Rad

ioca

rbon

age

(BP

)

2 240

2 260

2 280

2 300

2 320

2 340

2 360

2 380

2 400

2 420

2 440

2 460

2 480

2 500


Cal BC750 700 65 0 600 5 50 500 450 4 00 350 300

239 0±40 B P

72





C al BC 390 to 19 0 (Cal BP 2 340 to 2140)

Intercept data










R eference s:

Rad

ioca

rbon

age

(BP

)

2 080

2 100

2 120

2 140

2 160

2 180

2 200

2 220

2 240

2 260

2 280

2 300

2 320

2 340


Cal BC400 380 3 60 340 320 30 0 28 0 2 60 240 220 20 0 180

223 0±40 B P

73





C al BC 390 to 19 0 (Cal BP 2 340 to 2140)

Intercept data










R eference s:

Rad

ioca

rbon

age

(BP

)

2 080

2 100

2 120

2 140

2 160

2 180

2 200

2 220

2 240

2 260

2 280

2 300

2 320

2 340


Cal BC400 380 3 60 340 320 30 0 28 0 2 60 240 220 20 0 180

223 0±40 B P

74





C al BC 800 to 53 0 (Cal BP 2 750 to 2480)

Intercept data



Cal BC 780 to 750 (Ca l B P 2740 to 2700) andCal BC 690 to 660 (Ca l B P 2640 to 2610) andCal BC 640 to 590 (Ca l B P 2590 to 2540)






R eference s:

Rad

ioca

rbon

age

(BP

)

2 380

2 400

2 420

2 440

2 460

2 480

2 500

2 520

2 540

2 560

2 580

2 600

2 620

2 640


Cal BC850 8 00 75 0 700 650 6 00 55 0 500 450

253 0±40 B P

75





C al A D 120 to 330 (C al BP 183 0 to 1620)

Intercept data



Cal AD 140 to 250 (C al BP 1810 to 17 00)






R eference s:

Rad

ioca

rbon

age

(BP

)

1 660

1 680

1 700

1 720

1 740

1 760

1 780

1 800

1 820

1 840

1 860

1 880

1 900

1 920


Cal AD100 12 0 14 0 16 0 1 80 200 220 240 260 28 0 3 00 3 20 3 40 360

180 0±40 B P

76

C ALIBR ATIO N OF R AD IO CAR B ON AGE TO CA LEND AR Y EARS(Variable s: C 13/C 12=-26:lab. m u lt=1)




C al BC 760 to 40 0 (Cal BP 2 710 to 2350)

Intercept data



Cal BC 740 to 690 (Ca l B P 2690 to 2640) andCal BC 660 to 640 (Ca l B P 2610 to 2590) andCal BC 550 to 410 (Ca l B P 2500 to 2360)






R eference s:

Rad

ioca

rbon

age

(BP

)

2 300

2 320

2 340

2 360

2 380

2 400

2 420

2 440

2 460

2 480

2 500

2 520

2 540

2 560


Cal BC800 750 70 0 650 6 00 550 500 4 50 400 350

244 0±40 B P

77

Digital signature on file

June 3, 2011

Dr. James AbbottTexas Department of TransportationCultural Resource ManagementEnvironmental Affairs Division125 East 11th StreetAustin, TX 78701

RE: Radiocarbon Dating Results For Samples WM1126-C101, WM1126-C157, WM1126-C160,WM1126-S29, WM1126-S36, 41KM226 812 CA, 41KM226 813 CB

Dear Dr. Abbott:

Enclosed are the radiocarbon dating results for seven samples recently sent to us. They eachprovided plenty of carbon for accurate measurements and all the analyses proceeded normally. As usual,the method of analysis is listed on the report with the results and calibration data is provided whereapplicable.

As always, no students or intern researchers who would necessarily be distracted with otherobligations and priorities were used in the analyses. We analyzed them with the combined attention ofour entire professional staff.

If you have specific questions about the analyses, please contact us. We are always available toanswer your questions.

Our invoice has been sent separately. Thank you for your prior efforts in arranging payment. Asalways, if you have any questions or would like to discuss the results, don’t hesitate to contact me.

Sincerely,

78







Beta - 299317 1940 +/- 30 BP -23.2 o/oo 1970 +/- 30 BPSAMPLE : WM1126-S29ANALYSIS : AMS-Standard deliveryMATERIAL/PRETREATMENT : (charred material): acid/alkali/acid2 SIGMA CALIBRATION : Cal BC 40 to Cal AD 80 (Cal BP 1990 to 1870)____________________________________________________________________________________

79



Beta - 299318 2370 +/- 30 BP -23.3 o/oo 2400 +/- 30 BPSAMPLE : WM1126-S36ANALYSIS : AMS-Standard deliveryMATERIAL/PRETREATMENT : (charred material): acid/alkali/acid2 SIGMA CALIBRATION : Cal BC 720 to 700 (Cal BP 2670 to 2650) AND Cal BC 540 to 400 (Cal BP 2490 to 2350)____________________________________________________________________________________

Beta - 299319 4410 +/- 30 BP -20.8 o/oo 4480 +/- 30 BPSAMPLE : 41KM226 812 CAANALYSIS : AMS-Standard deliveryMATERIAL/PRETREATMENT : (organic sediment): acid washes2 SIGMA CALIBRATION : Cal BC 3340 to 3080 (Cal BP 5290 to 5030) AND Cal BC 3060 to 3030 (Cal BP 5010 to 4980)____________________________________________________________________________________

Beta - 299325 6030 +/- 40 BP -24.4 o/oo 6040 +/- 40 BPSAMPLE : 41KM226 813 CBANALYSIS : AMS-Standard deliveryMATERIAL/PRETREATMENT : (charred material): acid/alkali/acid2 SIGMA CALIBRATION : Cal BC 5040 to 4840 (Cal BP 6990 to 6790)____________________________________________________________________________________

80

CALIBRATION OF RAD IOCARB ON AGE TO CALENDAR YEARS(V ariables: C13/C12=-25.2 :lab. mult=1)

Laboratory nu mber: Beta-299314

Conventional rad iocarbon age: 2050±30 B P

2 Sigma calibrated result:(95% probab ility )

Cal BC 160 to C al AD 10 (Cal BP 2110 to 1940)

In tercep t data

In tercep t of rad iocarbon agewith calibration curve: Cal BC 50 (Cal BP 2000)

1 Sigma calib rated resu lt:(68% probab ility)

Cal BC 90 to 30 (Cal B P 2040 to 1980)

4985 S.W . 74 th Co u rt , M ia mi, F lo rida 331 5 5 • Tel : (3 05 )667 -51 6 7 • F a x: (30 5 )6 63 -0 9 64 • E -Ma il: b eta@ ra d io ca rb o n.com

Beta Analytic Radiocarbon Dating Laboratory

Ta lm a, A. S., Vogel, J. C., 19 93 , Rad iocarbon 35 (2), p317 -322A Simplified A pproach to Calibratin g C 14 DatesMathematics

I ntCal04 : C alib ration Issue o f Radiocarbon (Vo lu me 46, nr 3 , 2004).IN TC AL04 R adiocarbon A ge Ca libra tionCalibration Da tabase

INTC AL0 4Databa se used

References:

Rad

ioca

rbo

nag

e(B

P)

1 940

1 960

1 980

2 000

2 020

2 040

2 060

2 080

2 100

2 120

2 140

Charred m ate rial2 160

Cal BC/ AD180 160 1 40 1 20 10 0 80 60 40 2 0 0 20 40

205 0±30 BP

81

CALIBRATION OF RAD IOCARB ON AGE TO CALENDAR YEARS(V ariables: C13/C12=-25:lab . mult=1)




Cal AD 230 to 380 (Cal BP 1720 to 1570)

In tercep t data

In tercep ts o f radiocarbon agewith calibration curve: Cal AD 260 (C al BP 1690) and

Cal AD 300 (C al BP 1650) andCal AD 310 (C al BP 1640)


Cal AD 240 to 330 (C al BP 1710 to 1620)






References:

Rad

ioca

rbo

nag

e(B

P)

1 640

1 660

1 680

1 700

1 720

1 740

1 760

1 780

1 800

1 820

1 840


Cal AD200 22 0 2 40 260 280 3 00 320 340 36 0 3 80 400

175 0±30 BP

82





Cal BC 170 to 10 (Cal B P 2120 to 1960)

In tercep t data


1 Sigma calib rated resu lts:(68% probab ility)

Cal BC 150 to 140 (Cal BP 2100 to 2090) andCal BC 110 to 40 (Cal BP 2060 to 1990)






References:

Rad

ioca

rbo

nag

e(B

P)

1 960

1 980

2 000

2 020

2 040

2 060

2 080

2 100

2 120

2 140

2 160


Cal BC/ AD180 160 140 120 100 80 6 0 40 2 0 0

207 0±30 BP

83





Cal BC 40 to Cal AD 80 (Cal B P 1990 to 1870)

In tercep t data

In tercep t of rad iocarbon agewith calibration curve: Cal AD 30 (Cal BP 1920)


Cal AD 10 to 60 (Cal BP 1940 to 1880)






References:

Rad

ioca

rbo

nag

e(B

P)

1 860

1 880

1 900

1 920

1 940

1 960

1 980

2 000

2 020

2 040

2 060


Cal BC/ AD50 40 30 20 10 0 10 20 30 40 50 60 70 8 0 90

197 0±30 BP

84




2 Sigma calibrated results:(95% probab ility )


In tercep t data



Cal BC 510 to 400 (Cal BP 2460 to 2350)






References:

Rad

ioca

rbo

nag

e(B

P)

2 280

2 300

2 320

2 340

2 360

2 380

2 400

2 420

2 440

2 460

2 480


Cal BC750 70 0 65 0 6 00 5 50 500 450 40 0 35 0 300

240 0±30 BP

85




2 Sigma calibrated results:(95% probab ility )


In tercep t data

In tercep ts o f radiocarbon agewith calibration curve: Cal BC 3270 (Cal BP 5220) and

Cal BC 3240 (Cal BP 5190) andCal BC 3110 (Cal BP 5060)


Cal BC 3330 to 3210 (C al BP 5280 to 5160) andCal BC 3180 to 3150 (C al BP 5130 to 5100) andCal BC 3130 to 3090 (C al BP 5080 to 5040)






References:

Rad

ioca

rbo

nag

e(B

P)

4 360

4 380

4 400

4 420

4 440

4 460

4 480

4 500

4 520

4 540

4 560

Orga nic s ed im ent4 580

Cal BC340 0 3 350 330 0 3 250 32 00 3150 31 00 3050 3000

448 0±30 BP

86





Cal BC 5040 to 4840 (Cal BP 6990 to 6790)

In tercep t data



Cal BC 4990 to 4900 (C al BP 6940 to 6850) andCal BC 4860 to 4860 (C al BP 6810 to 6810)






References:

Rad

ioca

rbo

nag

e(B

P)

5 900

5 920

5 940

5 960

5 980

6 000

6 020

6 040

6 060

6 080

6 100

6 120

6 140

6 160


Cal BC506 0 50 40 5 020 5000 498 0 49 60 4940 492 0 49 00 4 880 4860 48 40 4820

604 0±40 BP

87

88

Documents

APPENDIX A RADIOCARBON ASSAYS