3.4 Looking At Fossils
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the remains or physical evidence of an organism preserved by geological processes
fossil
a fossilized mark that is formed in soft sediment by the movement of an animal
trace fossil
a mark or cavity made in a sedimentary surface by a shell or other body
mold
a type of fossil that forms when sediment fill in a cavity left by a decomposed organism
cast
a fossil that is found in the rock layers of only one geological age and that is used to established the age of the rock layers
index fossil
process in which minerals replace a organisms tissues
petrifaction
process in which the pore space in an organisms hard tissue is filled up with mineral
permineralization
process in which an organisms tissue is completely replaced
replacment
animal poop
coprolite