biostrome

[bahy-uh-strohm]

noun Geology.

a bedded, blanketlike sedimentary deposit of organic origin built by marine organisms and including shell beds, flat reefs, and corals.

Origin:
1930–35; bio- + Greek strôma layer, bed; see stroma

Related forms

bi·o·stro·mal, adjective

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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Biostrome is always a great word to know.

So is core. Does it mean:

process where the surface of the earth is worn away by the action of water, glaciers, winds, waves

central portion of the earth believed to be composed mainly of iron and nickel in a molten state

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Collins

World English Dictionary

biostrome (ˈbaɪəˌstrəʊm)

—n
	a rock layer consisting of a deposit of organic material, such as fossils

[C20: from bio- + Greek strōma covering]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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biostrome

bi·o·strome