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Section 27.2 - Section 27.2 Tools for Studying History The...

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Section 27.2 Tools for Studying History: The Fossil Record The fossil record gives direct evidence to two things: name two of them CARLY? o What organisms that lived in the past Looked like Where they lived When they existed A fossil is a piece of physical evidence from an organism that lived in the past and the fossil record is a total collection of all the fossils How do fossils form? o Fossils begin to form when the organism is somewhat or completely buried in ash, sand, mud or some other type of sediment o Figure 27.6 shows it nicely o Preservation after burial After burial many things can happen: (will explain two) Intact fossil: the organic remains are preserved intact Compression fossil: sediments accumulate on top and can compress the organic material below into a thin carbonaceous film Cast fossil: the remains decompose after burial and dissolved minerals fill it and creates a cast Permineralized fossil: if it rots really slowly, dissolved minerals
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