canine footprint Geology 105: History of Life
  Updated: 6/15/98

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Geologic Time Scale

History of Life is a 3-unit general education course that discusses the 4 billion year history of life on earth as interpreted from the fossil record.

Fossils are recorded in rocks much like your footprints are recorded on a beach. As you walk along the beach, if the sand is fine enough and soft enough, you will make footprints. If the wind and waves do not destroy your footprints, they may record your existance well past your passing.

Fossils are "footprints". Against the odds, these records of past life are preserved. In the History of Life, we examine the processes of geology and biology that allow the recording and preservation of these "footprints".

Discussions include:

Once we understand the nature and limitations of the "footprints", we will track the history of life as record by them.

Topics include:

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© 1998 Tom Clifton, SFSU

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