Myledaphus bipartitus Cope, 1876

Remarks

• Collector:    Lee Garrison

• Formation:  Montana Group, Hell Creek Formation

• Location:     Harding County, SD

• Myledaphus bipartitus Cope is a fresh/brackish water ray.

General Info

Synonyms (older names and misidentifications in the literature)

• ray
• 1875 Myledaphus bipartitus Cope
• 1902 Myledaphus bipartitus Cope; Lambe
• 1908 Myledaphus bipartitus Cope;Hussakof
• 1909 Myledaphus bipartitus Cope; Sternberg
• 1964 Myledaphus bipartitus Cope; Estes
• 1974 Myledaphus bipartitus Cope; Johnson & Storer
• 1978 Myledaphus bipartitus Cope; Case
• 1987 Myledaphus bipartitus Cope; Cappetta
• 1999 Myledaphus bipartitus Cope; Wroblewski
• 1999 Myledaphus bipartitus Cope; Beavan & Russell
• 2005 Myledaphus bipartitus Cope; Thompson

Stratigraphic Occurrence

• Montana Group, Hell Creek Formation of South Dakota
• Montana Group, possibly Ferris Formation of Wyoming
• Montana Group, Judith River Formation of Montana
• Mesaverde Group, Straight Cliffs Formation, John Henry Member of Utah
• Kaiparowits Formation of Utah
• Uppermost Dinosaur Park Formation, Lethbridge Member of Alberta, Canada
• Reported to range into the early Eocene

Age

• Myledaphus bipartitus Cope ranges from the late Middle Campanian Stage to early Tertiary (Eocene) Period (~76–50 mya).

Geographic Occurrence (not an all-inclusive list)

• Alberta, Canada
• Blaine County, MT
• Garfield County, UT
• Harding County, SD
• Hill County, MT
• Kane County, UT

Remarks

       For identification and descriptions, see:

• Beavan, N. R.; Russell, A. P.  1999.  An Elasmobranch Assemblage from the Terrestial-Marine Transitional Lethbridge Coal Zone (Dinosaur Park Formation:  Upper Campanian), Alberta, Canada.  Journal of Paleontology 73(3), 500; fig's 3.24–3.26.

• Cappetta, H.  1987.  "Chondrichthyes II-Mesozoic and Cenozoic Elasmobranchii".  In:  Schultze, H.-P., ed.  Handbook of Paleoichthyology, Volume 3B.  Stuttgart:  Gustav Fischer Verlag, 140–141; fig's 119A–D (excellent figures).

• Case, G. R.  1978.  A New Selachian Fauna from the Judith River Formation (Campanian) of Montana.  Palaeontographica A (160), 198; plate 5, fig's 8a–e and 9.