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Unit Outline
• A: Fossil Record & Geologic Time– WSs: 8.1, 8.2, 8.3, & 8.4– Labs: 8.1, 8.2 & 8.3 (bonus)
• B: Relative Dating– WS: 8.5, Lab 8.4
• C: Absolute Dating– WS 8.5, Lab 8.5– Unit 2 Review WS + Unit 2 Test
Relative Dating • Involves placing events in the correct
sequence or order
12
34
10
5
6
9
7 = tilt = mtn’ bldg’
8 = erosion
14
1311
=
faul
ting
15 = erosion
12 = erosion
• Absolute Dating is determining how long ago something happened (ma)– ie. Dinosaurs became extinct 65 ma ago.
• Using the principle of Uniformitarianism, six principles have been developed
3. Principle of Lateral Continuity: sediments continue in all directions until they thin and are pinched out at the edge of the basin.
4. Principle of Cross-cutting Relationships: an igneous intrusion (or fault) is younger than the rock it intrudes (crosses).
1
432
Unconformities
• Break or portion of time (hiatus) is missing
• Cause: period of non-deposition, period of erosion or mountain building
• 3 types
1. Disconformity: surface of erosion or non-deposition (hard to detect)
weathering, oxidation, jointing, etc.
Sed’ RxSed’ Rx
3. Nonconformity: erosion surface is cut into metamorphic or igneous rocks. Use principle of inclusions to determine if it is an intrusion or a nonconformity.
Ign’ or met’ Rx
Sed’ Rx
Do Lab 8-4 Relative DatingDo Lab 8-4 Relative DatingWork on WS 8-5Work on WS 8-5Work on Chp. 8 Review WSWork on Chp. 8 Review WS