Meaning of biostrome

bi•o•strome

Pronunciation: (bī'u-strōm"), [key]
— n. Geol.
  1. a bedded, blanketlike sedimentary deposit of organic origin built by marine organisms and including shell beds, flat reefs, and corals.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.