biostratigraphicadj.

1925 Amer. Jrnl. Sci. 209 81 Wedekind's biostratigraphic work is a prophecy of what the future has in store, not only for evolution for classification, but equally for stratigraphy.

1950 Bull. Amer. Petroleum Geologists 34 2365 Our repeated efforts to treat stage and zone as true time-stratigraphic units have met with failure... These are biostratigraphic or lithostratigraphic in character.

1970 Earth-Sci. Rev. 6 275 A biostratigraphic unit is a body of rocks which is delimited from the adjacent rock masses on the basis of unifying contemporaneous palaeontological characteristics.

1985 Times 22 Jan. 16/7 The ostracoderms in the Welsh borderland could be used to correlate and age the rocks. This was the first time that such a biostratigraphic scheme had been achieved.

2006 D. H. Erwin Extinction iii. 73 Ammonoids long served as the main biostratigraphic tool for correlating Permian and Triassic rocks within regions.