The Lincoln Limestone Member of the Greenhorn Limestone is a mid-Cenomanian (94.7–95 Ma) deposit of the Late Cretaceous Western Interior Seaway in North America. Fossiliferous rock samples from the Lincoln Limestone were collected at a new locality (‘Table Mesa locality’) in southeastern Colorado. Acid treatment of the rock samples yielded at least 29 vertebrate taxa, including 13 chondiichthyan and 14 osteichthyan fishes as well as two reptilian (squamate) taxa. The taxonomic composition of the fauna broadly resembles previously described mid-Cenomanian localities in North America that further demonstrates the high taxonomic homogeneity of vertebrates in the Western Interior Seaway. Although the occurence of a terrestrial lizaid is noteworthy, proportions of common taxa at the Table Mesa locality are particularity similar to another Lincoln Limestone locality situated about 100 km to the west where remains of bony fishes also dominate.
Western Interior Seaway