Stanton, T.W. 1909. The age and stratigraphic relations of the “Ceratops beds” of Wyoming and Montana. Proc. Washington Acad. Sci. 11(3): 239-293.
‘Meek’ of Authors.
Whitfield, 1903. Bull. AMNH 19: 487.
Stanton, 1909. Proc. Washington Acad. Sci. 11(3): 248.
(misidentified reference to Unio vetusta Meek, 1860)