Evidence from Geology and Fossil Record

Evidence from Geology and Fossil Record - Evidence from the...

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Evidence from the fossil record If theory of evolution is valid, then there is a temporal relationship between the appearance of fossil remains and age of geological formations Determining the age of sediments and fossils Radioactivity == isotopes 12 C 14 C ; 14 C 14 N Radioactive dating; Half-life = time for ½ atoms to disintegrate 238 U 206 Pb Half life of 238 U to 206 Pb is 4.5 billion years
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Radioactive decay
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Radioactive elements Common dating methodologies ½ LIFE U Pb direct decay 4.5 b.y. K Ar direct decay 1.25 b.y. Ru Sr direct decay 48.8 b.y. 14 C 12 C C to N decay 5,730 y
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Reliability of dating methods 1. Test for constant decay 2. Test against samples of known ages 3. Cross-checking methods (most powerful technique in sciences 4. Compare dates and strata levels 550 Age m.y.a. 350 present Recent (surface) Cambrian (deep) depth of rock
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Premineralization Original material Carbonized film Molds and Casts Chemical fossils Trace fossils Fossil type review
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Evidence from Geology and Fossil Record - Evidence from the...

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