spicular chert

A Dictionary of Earth Sciences | 1999 | 238 words | Copyright

spicular chert A very fine-grained siliceous sedimentary rock, the silica originating from the accumulation of sponge (Porifera) spicules. Sponge spicules can be an important source of biogenic silica in shelf-sea environments. See CHERT.

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AILSA ALLABY and MICHAEL ALLABY. "spicular chert." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 10 Feb. 2012 <http://www.encyclopedia.com>.

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AILSA ALLABY and MICHAEL ALLABY. "spicular chert." A Dictionary of Earth Sciences. 1999. Retrieved February 10, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-spicularchert.html

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