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Ch 6 sec 4 vocab

how many times must i say it? READ THE TITLE!!

QuestionAnswer
A fossil that is used to establish the age of a rock layer because the fossil is distinct, abundant, and widespread and the species existed for only a short span of geologic time. Index fossil
A type of fossil that forms when sediments fill in the cavity left by a decomposed organism. Cast
In biology, a fungus that looks like wool or cotton. Mold
A fossilized structure, such as a footprint or a coprolite, that formed in sedimentary rock by animal activity on or within soft sediment. Trace Fossil
The trace of remains of an organism that lived long ago, most commonly perserved in sedimentary rock. Fossil
Created by: koolbeans12
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