The Del Rio Formation is Lower Cretaceous (Cenomanian Stage). It contains marine bivalves, echinoids, and shark teeth. A good nontechnical reference is C. Finsley, 1996, "A Field Guide to Fossils of Texas," 2nd Edition, Gulf Publ. Co., Houston, TX. A very good reference for shark fossils from this formation is The Collector's Guide to Fossil Sharks and Rays from the Cretaceous of Texas, by B, J. Welton and R. F. Farish (Before Time, Lewisville, TX, 1993). All of the shark teeth were found near the contact between the Del Rio Formation and the overlying Pepper Shale (Cenomanian Stage), so they could be from the Pepper Shale.
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