Context, naming, and formal designation of the Cretaceous Hell Creek Formation lectostratotype, Garfield County, Montana

2014 ◽  
Author(s):  
Joseph H. Hartman ◽  
Raymond D. Butler ◽  
Matthew W. Weiler ◽  
Karew K. Schumaker
Keyword(s):  
Hell Creek Formation ◽  
Garfield County

Pelecypods of the Hell Creek Formation (Uppermost Cretaceous) of Garfield County, Montana

1976 ◽  
Vol 13 (2) ◽  
pp. 365-388 ◽  
Author(s):  
Loris S. Russell
Keyword(s):  
Vertebrate Fauna ◽  
Hell Creek Formation ◽  
Garfield County

The Hell Creek Formation of eastern Montana, which forms the top of the Cretaceous section, contains in addition to a rich vertebrate fauna a distinctive assemblage of pelecypods, made up of three species of Plesielliptio, one of Rhabdotophorus, two of Plethobasus, one of Quadrula, nine of Proparreysia, one of Obovaria?, one of Corbicula, and one of Sphaerium. Many of the species show distinctive ornamentation, analogous to that of living Unionacea in the Mississippi drainage. One species of Plesielliptio, one of Proparreysia, and one of Sphaerium are new. There is some community of species with the faunas of the Lance and Black Buttes formations of Wyoming, less with the older Cretaceous assemblages, and none with the abundant mollusks of the Paleocene Fort Union formations.

Ugrosaurus olsoni, a new ceratopsian (Reptilia: Ornithischia) from the Hell Creek Formation of eastern Montana

1987 ◽  
Vol 61 (1) ◽  
pp. 148-154 ◽  
Author(s):  
Emily A. Cobabe ◽  
David E. Fastovsky
Keyword(s):  
New Taxon ◽  
Diagnostic Features ◽  
Hell Creek Formation ◽  
Garfield County

Fragments of a ceratopsian dinosaur from the Maastrichtian Hell Creek Formation, Garfield County, Montana, are unlike any known ceratopsian. Diagnostic features include a low, rounded nasal boss, an especially deep rostral-premaxillary pit, and paired choanae. The snout is elongate. The new taxon, Ugrosaurus olsoni, is referred to the Ceratopsidae.

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