The lower Eocene sediments below the basal Sabine (Wilcox) Ostrea thirsae zone have a surface thickness of approximately 800 feet in the Sabine Uplift region of northwestern Louisiana. The upper 300 feet of the sediments contain a very limited fauna. The lower 500 feet of sediments carry a varied fauna which is older than the Solomon Creek fauna of Texas (basal Wilcox or upper Midway in age) and correlated with the upper Midway faunas of the Alabama Naheola formation and the Kerens member of of the Wills Point formation of Texas. This correlation is based on the results of a detail study of over ninety species from fifteen previously undescribed localities in Sabine, Natchitoches, and DeSoto parishes.

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