Dictionary.com
definitions

biostratigraphy

[bahy-oh-struh-tig-ruh-fee]
noun
  1. a branch of geology dealing with the differentiation of sedimentary rock units on the basis of the fossils they contain.

Origin of biostratigraphy

bio- + stratigraphy
Related formsbi·o·strat·i·graph·ic [bahy-oh-strat-i-graf-ik] /ˌbaɪ oʊˌstræt ɪˈgræf ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
biostratigraphy in Science

biostratigraphy

[bī′ō-strə-tĭg′rə-fē]
  1. The study and categorization of rock strata based on their fossil content and distribution. Biostratigraphic data are often considered together with radiometric and paleoenvironmental data as a means of dating rock strata. Compare lithostratigraphy.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.