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Primate Evolution - Anthropology 116

Primate Evolution - Anthropology 116 - Anthropology 116...

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Anthropology 116 – Primate Evolution Time Scales o 65 million years ago the first mammals appeared o First primates about 65 million years ago o 7-8 million years ago the first hominids emerged o 200,000 years ago the first humans appeared o Space The Earth has changed drastically over the last couple hundred million years 135 mya first split in the pangea Then South America split off Then India attached to Asia and Antarctica separated from Australia The Environment o Look at the ratios of O16 and O18 in the environment o Illustrates the difference in temperature fluctuation o When temperature is colder you find more O18 in sea water Look at the ice cores The air bubbles in these cores Look at the exoskeletons of tiny plankton The absorb oxygen from the seas water o Can measure the temperature of the earth a long time ago o Lower O18 levels during Paleocene, Eocene, but rising during the Oligocene The earth began to cool
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