Sediment inclusions encountered in the Belle Isle salt stock, near the south coast of Louisiana, contain microfaunas of the Frio and Anahuac Formations. This is the most southerly reported occurrence of these two stratigraphic units. The Anahuac assemblage is of particular interest because it lived in inner neritic water depths. The Frio assemblage lived in outer neritic water depths. Structural displacement of the Anahuac inclusions is estimated to be in excess of 22,000 feet.

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