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2015 Pearson Education, Inc. Laboratory Manual in Physical Geology, 10e Image PPTs Chapter 8 Dating of Rocks, Fossils, and Geologic Events Slide 2 2015 Pearson Education, Inc. GEOLOGIC TIME (AGE) RELATIVE Comparison of Features relative to one another ABSOLUTE Establish or determine numerical dates for Features Slide 3 2015 Pearson Education, Inc. LAWS (PRINCIPALS) OF DETERMINING RELATIVE AGE ORIGINAL HORIZONTALITY LATERAL CONTINUITY SUPERPOSITION UNCONFORMITIES (WITH 3 ABOVE) INCLUSIONS Erosional (float) Igneous Intrusions CROSS-CUTTING FEATURES Faults Unconformities Igneous Intrusions Slide 4 2015 Pearson Education, Inc. Slide 5 UNCONFORMITIES Slide 6 2015 Pearson Education, Inc. ORIGINAL HORIZONTALITY & SUPERPOSITION DCBADCBA Slide 7 2015 Pearson Education, Inc. ORIGINAL HORIZONTALITY, SUPERPOSITION & INCLUSIONS CBACBA Slide 8 2015 Pearson Education, Inc. ORIGINAL HORIZONTALITY, SUPERPOSITION, UNCONFORMITIES, & INCLUSIONS FEDCBAFEDCBA Slide 9 2015 Pearson Education, Inc. ORIGINAL HORIZONTALITY, SUPERPOSITION, UNCONFORMITIES, CROSS-CUTTING FEATURES, & INCLUSIONS HGFEDCBAHGFEDCBA Slide 10 2015 Pearson Education, Inc. CROSS-CUTTING FEATURES CBACBA Slide 11 2015 Pearson Education, Inc. ORIGINAL HORIZONTALITY, SUPERPOSITION, UNCONFORMITIES, CROSS-CUTTING FEATURES, & INCLUSIONS FEDCBAFEDCBA Slide 12 2015 Pearson Education, Inc. ORIGINAL HORIZONTALITY, SUPERPOSITION, UNCONFORMITIES, CROSS-CUTTING FEATURES, & INCLUSIONS FEDCBAFEDCBA Slide 13 2015 Pearson Education, Inc. PUZZLE: 1.Look at overall picture and see where the oldest units are. 2.Work your way upward from oldest to youngest looking at the relational features using the principals Slide 14 2015 Pearson Education, Inc. Slide 15 Slide 16 Slide 17 Carbon-14; Half-life = 5,730 Years; 12.5% of C-14 Left. # Half-lifes? Age? 3 Half-lives: 3 x 5,730 years = 17,190 years Slide 18 2015 Pearson Education, Inc. PAGE 223 Slide 19 2015 Pearson Education, Inc. ACTIVITIES 8.2: A, B 8.4: A, B, C, D(1), E 8.5: A