Fossils and Age
Very limited detailed descriptions of the Haynesville Shale indicated that it is fossiliferous. The reported fossils include unidentified coccoliths, bivalves, gastropods, and calcispheres. Both stratigraphic relationships and a nannofossil (ccocolith) assemblage described from it indicates that it is Kimmeridgian, 151 to 157 million years old, in age.
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