ANTH 1001 4-3-08

ANTH 1001 4-3-08 - ANTH 1001 - 4/3/08 Paleontology: General...

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ANTH 1001 -- 4/3/08 Paleontology: General Issues I. Nature of a fossil (What is a fossil) II. Geological time scale III. Dating techniques IV. Plate tectonics -- Already began dating techniques You’re dating the volcanic rock in association with the bones, not the actual fossils (fossils are somewhere between two dates provided by rocks- rocks above and below fossils) Half-life- amount of time for an element to lose ½ of it’s radioactivity -- Dating techniques: A. Potassium-Argon technique 40 K 40 Ar Half-life of 40 K is 1.25 billion years B. Carbon-14 14 N / 14 C Atmosphere: 14 C and 12 C (constant ratio in atmosphere) In our bones, we have this same ratio Half-life of 14 C is 5,730 years (only useful up to 40-70,000 yrs ago) Plate Tectonics: As plates slide (earthquake), collide (subduction- create mountains) 225 million years ago – Pangaea 135 million years ago—Northern and Southern landmass 90 million years ago—S. America and Africa separate
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Plate tectonics: 1) Position of landmasses is not static/constant. Plate tectonics affects climate, general ecology, and migration routes. 2) N. America and Europe were connected were connected to one another during the Paleocene and much of the Eocene. This connection helps explain geographical distribution among Eocene primates (and their similarity and anatomy). 3)
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ANTH 1001 4-3-08 - ANTH 1001 - 4/3/08 Paleontology: General...

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