Case, G.R. & Cappetta, H. (1997)
A new selachian fauna from the Late Maastrichtian of Texas (Upper Cretaceous/Navarro Group; Kemp Formation). Münchner Geowissenschaftliche Abhandlungen Reihe A, Geologie und Paläontologie, 34, 131–189, 10 fig., 15 pl.

Hartstein, E. & Decina, L. & Keil, R. (1999)
A late Cretaceous (Severn Formation) Vertebrate Assemblage from Bowie Maryland. Mosasaur, 6, 17–24