BIOL 180 Chapter Notes - Chapter 6: Cenozoic, Archean, Phanerozoic
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BIOL 180 Full Course Notes
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Document Summary
25. 5 - tools for studying history; the fossil record: Fossil - a piece of physical evidence from an organisms that lived in the past. Fossil record- the total collection of fossils that have been found throughout the world. Housed in thousands of private and public collections. The process that forms fossils begins when part or all of an organisms is buried in ash, sand, mud, or some other type of sediment. Forms when decomposition does not occur and the organic remains are preserved intact. Forms when sediments accumulate on top of the organisms and become cemented into rocks such as mudstone or shale. The sediments" weight compresses the organic material below into a thin, carbonaceous lm. Forms when organisms decompose after they are buried. The hole that remains lls with dissolved minerals, which create an accurate cast of the remains. Dissolved minerals gradually in ltrate the interior of cells and harden into stone.
