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¹ » ¹ » » k 80 20 75 26 20 20 20 73 ¹ ¹ » ¹ k Volcanic Dip Dip Of Fault Sedimentary Dip Fault Traverse Line Symbols Contact Bedrock Outcrop References Miller, J.D., Jr., and Green, J.C., 2008, Bedrock Geology of Duluth Heights and Eastern Portions of the Adolph Quadrangles, St. Louis County, Minnesota. Minnesota Geological Survey Mis- cellaneous Map M-181, Scale 1:24,000. Miller, J.D., Jr., and Green, J.C., 2008, Bedrock Geology of West Duluth and Eastern Portion of Esko Quadrangles, St. Louis County, Minnesota. Minnesota Geological Survey Mis- cellaneous Map M-183, Scale 1:24,000. μ 0 1,000 2,000 3,000 4,000 500 Feet 0 250 500 750 1,000 125 Meters Duluth Complex: Gabbro - Medium to coarse grain, Olivine, Pyroxene, Plagioclase Feldspar, Magnetite in Pyroxene. Large Pyroxene Crystals Indicating water in magma during crystalization, which also means near a contact zone. Ely’s Peak Basalt: Basalt - Pyroxene rich basalt with vesicle columns throughout . Fine grain basalt domin- ates the southern half of the Ely’s Peak Basalt and coarse grain basalt in the north half. Some areas are Amygdaloidal. Some Porphoritic zones scattered through formation. Nopeming Sandstone: Interbedded meta-siltstone and meta-quartzite, lying uncomformably on top of Thompson Formation. Deposited through alluvial deposits or possibly lakes. Thompson Formation: Interbedded slate and grey- wacke with concretions throughout the bed. Also Quartz veins are present throughout the bed. The out- crops exhibit cleavage parallel/sub-parallel to the bed- ding plane. The bed is dipping steeply throughout, about 70 to 80 degrees. Meso-Proterozoic Paleo-Proterozoic 1450 1200 950 750 Cross Section Description Of Units Correlation Of Map Units A’ A A A’ Elevation Ga Ba Ss Gw Ba Ba Ba Ss Ss Gw Gw Gw Ga Ga Ga Ga Ba Ss Gw Ba Ga Ss Gw Wesley R. Lueck University Of Minnesota Duluth 5/8/2010 Bedrock Geology Of Midway Area Esko Quadrangle By

Bedrock Geology Of Midway Area Wesley R. Lueck Esko ... · cellaneous Map M-183, Scale 1:24,000. ... Gw Ba Ba Ba Ss Ss Gw Gw Gw Ga Ga Ga Ga Ba Ss Gw Ba Ga Ss Gw Wesley R. Lueck

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Page 1: Bedrock Geology Of Midway Area Wesley R. Lueck Esko ... · cellaneous Map M-183, Scale 1:24,000. ... Gw Ba Ba Ba Ss Ss Gw Gw Gw Ga Ga Ga Ga Ba Ss Gw Ba Ga Ss Gw Wesley R. Lueck

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»

k80

20

7526

20

2020

73¹

¹

»

¹k Volcanic Dip

Dip Of Fault

Sedimentary Dip

Fault

Traverse Line

Symbols

Contact

Bedrock Outcrop

ReferencesMiller, J.D., Jr., and Green, J.C., 2008, Bedrock Geology of Duluth Heights and Eastern Portions of the Adolph Quadrangles, St. Louis County, Minnesota. Minnesota Geological Survey Mis- cellaneous Map M-181, Scale 1:24,000. Miller, J.D., Jr., and Green, J.C., 2008, Bedrock Geology of West Duluth and Eastern Portion of Esko Quadrangles, St. Louis County, Minnesota. Minnesota Geological Survey Mis- cellaneous Map M-183, Scale 1:24,000.

µ0 1,000 2,000 3,000 4,000500

Feet

0

250

500 750 1,000125Meters

Duluth Complex: Gabbro - Medium to coarse grain, Olivine, Pyroxene, Plagioclase Feldspar, Magnetite in Pyroxene. Large Pyroxene Crystals Indicating water in magma during crystalization, which also means near a contact zone.

Ely’s Peak Basalt: Basalt - Pyroxene rich basalt with vesicle columns throughout . Fine grain basalt domin- ates the southern half of the Ely’s Peak Basalt and coarse grain basalt in the north half. Some areas are Amygdaloidal. Some Porphoritic zones scattered through formation.

Nopeming Sandstone: Interbedded meta-siltstone and meta-quartzite, lying uncomformably on top of Thompson Formation. Deposited through alluvial deposits or possibly lakes.

Thompson Formation: Interbedded slate and grey- wacke with concretions throughout the bed. Also Quartz veins are present throughout the bed. The out- crops exhibit cleavage parallel/sub-parallel to the bed- ding plane. The bed is dipping steeply throughout, about 70 to 80 degrees.

Meso-Proterozoic

Paleo-Proterozoic

1450

1200

950

750

Cross Section

Description Of Units

Correlation Of Map Units

A’A

A A’E

leva

tion

Ga

Ba

Ss

Gw

Ba

Ba

Ba

Ss

SsGw

Gw

Gw

Ga

Ga

Ga

Ga

Ba Ss

Gw

BaGa

Ss

Gw

Wesley R. Lueck University Of Minnesota Duluth

5/8/2010

Bedrock Geology Of Midway AreaEsko Quadrangle By