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Biological Sedimentary Rock as edited by
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Biologic sedimentary rocks form when large numbers of living things die, pile up, and are compressed and cemented to form
rock. Accumulated carbon-rich plant material may form coal. Deposits made mostly of animal shells may form limestone, coquina, or chert.
[1]
References
- ↑ http://wrgis.wr.usgs.gov/docs/parks/rxmin/rock2.html
