--> Abstract: Differentiation of Shale Types by Allochthonous and Autochthonous Nannofossils, by W. W. Cooper; #90978 (1975).
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Abstract: Differentiation of Shale Types by Allochthonous and Autochthonous Nannofossils

W. W. Cooper

Examination of the calcareous nannofossils contained in the bit cuttings of Miocene rock from parts of three deep wells in south Louisiana allows differentiation of shale types on the basis of percentage of in-place and reworked forms.

A shale containing greater than 60 percent autochthonous nannofossils is identified and correlated for the wells studied. Results are consistent with a Previous HitbenthicTop foraminiferal zone "pick."

Preliminary results indicate that this method is widely applicable in Tertiary clastic sequences.

AAPG Search and Discovery Article #90978©1975 GCAGS-GC Section SEPM Annual Meeting, Jackson, Mississippi