Brett, Carlton E. Department of Geological Sciences, University of Rochester, Rochester, New York.
- Basis of biostratigraphy
- Typical index fossils through time
- Additional Reading
The skeletal remains (body fossils) or, rarely, the traces of activity (trace fossils) of animals, plants, protistans, and bacteria that can be used to uniquely identify the ages of sedimentary rocks. The term “index fossil” is nearly synonymous with guide fossil or zone fossil. See also: Fossil; Trace fossils
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