Bio stromal

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

biostromal, adjective
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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]

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