biostromen.
/ˈbʌɪəstrəʊm/, U.S. /ˈbaɪəˌstroʊm/, /ˈbaɪoʊˌstroʊm/ Geology.
A deposit consisting of a bed or sheet (as opposed to a mound or domed structure) of the calcareous skeletal remains of sedentary organisms (shells, crinoids, corals, etc.). Cf. bioherm n.
ΚΠ
1932 E. R. Cumings in Bull. Geol. Soc. Amer. 43 334 For purely bedded structures, such as shell beds, crinoid beds, coral beds, etcetera, consisting of and built..by sedentary organisms..I propose the name biostrome... Biostrome means literally an organic layer.
1961 J. Challinor Dict. Geol. 23/1 Where the biolith is a more or less extensive bed it is sometimes called a ‘biostrome’.
1981 Jrnl. Paleontol. 55 1284 A biostrome at Kuppen..on Gotland, Sweden, is dominated by densely packed laminar, domical and bulbous stromatoporoids.
2005 J. Laborel in M. L. Schwartz Encycl. Coastal Sci. 194/1 Both words ‘bioherm’ and ‘biostrome’ were obviously coined for fossil build-ups... Definitions vary according to authors.
Derivatives
bioˈstromal adj. of the nature of or formed from a biostrome; of or relating to a biostrome.
ΚΠ
1934 J. E. Adams in W. E. Wrather & F. H. Lahee Probl. Petroleum Geol. 358 Organic limestones are of two types, bedded or biostromal limestones and reef or biohermal limestones.
1952 Jrnl. Paleontol. 26 822 Ceritella protcori..at the type localities occupies a biostromal facies in the Edwards limestone.
1999 G. S. Visher Stratigr. Syst. v. xviii. 597 Biohermal sequences may be flanked by biostromal bedding units.
This entry has been updated (OED Third Edition, November 2010; most recently modified version published online December 2021).
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