Last modified on October 1, 2007, at 20:01

Biological Sedimentary Rock

Biological Sedimentary Rock.jpg
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

  1. http://wrgis.wr.usgs.gov/docs/parks/rxmin/rock2.html