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Unformatted text preview: form when the overlying sediment "compresses" the organism into a flat layer. This results in some of the original organic material of the vreature being preserved., often as thin carbonaceous films. However, many times the organic amterial is further decayed, leaving only a "part and counterpart" detailing the external form of the creature. Casts and molds are a type of preservation where the original material decays, leaving a mold in surrounding rock that can be filled with another sediment (cast). Casts can be external or internal, the latter being known as steinkerns. Petrifaction is the literal "turning to stone" by replacement of organic matter with silica. Petrified wood forms by this process....
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This note was uploaded on 11/29/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.
- Fall '10