Geology 12 Presents Hand out note helper WS 8.45 Hand out note helper WS 8.45.

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Presentation transcript:

Geology 12 Presents

Hand out note helper WS 8.45 Hand out note helper WS 8.45

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

B: Relative Dating Order of events: write numbers on sheet. 5 = 4 = tilting erosion

Relative Dating

Involves placing events in the correct sequence or order = tilt = mtn’ bldg’ 8 = erosion =faulting 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

1. Principle of Superposition: oldest rocks on bottom; youngest rocks on top.

2. Principle of Original Horizontality: sediments deposited in water in horizontal manner.

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)

8-erosion erosion

5. Principle of Inclusions: xenoliths/ inclusions are older than the rocks they’re in

1 3 2

erosion

6. Principle of Fossil Succession: fossils on bottom are older than fossils on top.

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’ Rx

2. Angular Unconformity: beds tilted then eroded before deposition (most common on exam )

Angular Unconformity

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

Practice Relative Dating Examples

Do Lab 8-4 Relative Dating Do Lab 8-4 Relative Dating Work on WS 8-5 Work on WS 8-5 Work on Chp. 8 Review WS Work on Chp. 8 Review WS