Mesodma formosa (Marsh, 1889)

Remarks

• Collection of:  Lee Garrison

• Formation:     Montana Group, Hell Creek Formation

• Location:        South Dakota

• Length:          3 mm

• Shown is a fourth premolar lower jaw tooth.

General Info

Synonyms (older names and misidentifications in the literature)

• 1889 Halodon formosus Marsh

• 1902 Does not = Cimolomys formosus (Marsh); Hay

• 1963 Mesodma formosus (Marsh); Clemens

• 1977 Mesodma formosus (Marsh); Novacek & Clemens

Stratigraphic Occurrence

• Paleocene
• Montana Group, Hell Creek Formation of South Dakota
• Montana Group, Hell Creek Formation of Montana
• Montana Group, Lance Formation of Wyoming

Age

• Mesodma formosa (Marsh) is a Maastrichtian to very early Tertiary (Paleocene) mammal (~66–63 mya).

Geographic Occurrence (by no means an all-inclusive list)

• South Dakota
• Wyoming

Remarks

         For identification and descriptions, see:

• Clemens, W. A., Jr.  1963.  Fossil Mammals of the Type Lance Formation Wyoming.  Part I.  Introduction and Multituberculata.  University of California Publications in Geological Sciences 48, 31–39, fig's 4–8.
• Novacek, M.; Clemens, W. A.  1977.  Aspects of Intrageneric Variation and Evolution of Mesodma (Multituberculata, Mammalia).  Journal of Paleontology 51 (4), 701–717.