PALec8 - Early Primate Evolution Lecture 8 Environment and...

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Early Primate Evolution Lecture 8
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Environment and its Reconstruction Part 1
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Ancient Landmasses As recently as 225 million years ago most of the land component of the earth was found in one super-continent we now call Pangaea . By 200 million years ago there were two landmasses we call Laurasia and Gondwanaland .
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Plate Tectonics The earth’s surface (that containing both land and water) is made up of a series interlocking sections, called tectonic plates, which are in constant (albeit relatively slow) motion. Due to the shifting these tectonic plates, Pangaea and later Laurasia and Gondwanaland began breaking up and moving until they have arrived at their present positions.
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Plate Tectonics 2 In part because of these shifts, environments of the past were in many cases radically different than those of today. These changes have had profound effects on the distribution and evolution of our primate ancestors.
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Evolution of Our Current Landmasses
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The Earth’s Climate is in a constant state of flux. Generally it oscillates between glacial (relatively cold periods) and interglacials (relatively warm periods).
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This note was uploaded on 02/13/2012 for the course ANTH 2 taught by Professor A during the Spring '08 term at Irvine Valley College.

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PALec8 - Early Primate Evolution Lecture 8 Environment and...

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