...Richard A. Sheppard; Frederick A. Mumpton Abstract Fluorite makes up 20-30% of a zeolitic tuff in a Pliocene or Pleistocene lacustrine facies of the Gila Conglomerate that has not been subjected to hydrothermal activity. The light gray zeolitic tuff is 40 cm thick and crops out over a 0.6-km 2 area...

... fluvial system of the Morrison Formation and the gravelly braided-river deposits of the Buckhorn Conglomerate has been studied to assess the dispersal of coarse clastics and the development of associated basin-wide unconformities in a sequence stratigraphic framework. The sharp contact between the two...

... in the Brushy Basin Member gives ages ranging from 99 to 123 Ma, covering a wide span of Early Cretaceous time. The bentonites dated are stratigraphically below what has been called the basal Buckhorn Conglomerate Member of the Cedar Mountain Formation. This may indicate that (1) the Buckhorn Conglomerate...

... of an Early Cretaceous unconformity. The overlying Cedar Mountain Formation is subdivided into two facies assemblages: (1) the Neocomian Buckhorn Conglomerate was deposited by northeast-trending, sandy-gravelly braided rivers that were incised into the underlying Morrison Formation; (2) an upper assemblage...

...Fig. 5.— Representative stratigraphic logs for the Buckhorn Conglomerate and Poison Strip Sandstone. A) Stratigraphic log through the Buckhorn Conglomerate from the Green River Cutoff Road. Numbers are shown to match the log to the outcrop photo in Part D. Location: 39°11′49.80″ N, 110°22′42.33...

... systems tracts of the LK-1 sequence represented by the Buckhorn Conglomerate. The Buckhorn is overlain by a sequence-bounding unconformity and transitional-aggradational systems tracts of the LK-2 sequence that is composed of the upper part of the Cedar Mountain Formation. The Upper Jurassic–Lower...

... in volcanic ash deposition is suggested by the Karla Kay conglomerate and adjacent mudstones of the Burro Canyon formation. The basal conglomerate of the Burro Canyon and Stokes’ Buckhorn conglomerate member of the Cedar Mountain formation of central Utah may be lithogenic equivalents. The general decrease...

...FIGURE 2 —Simplified stratigraphy of the oncolite and associated lithofacies directly overlying the Buckhorn Conglomerate Member. This idealized column is based on average thicknesses. In all sections, the contact with the underlying Buckhorn Conglomerate is sharp ...

...WM. LEE STOKES Abstract The Shinarump and Buckhorn conglomerates and the Dakota sandstone are widespread deposits of Mesozoic age in the western interior. The physical characters indicate a fluvial origin, but the wide areal extent, scarcity of fossils, and exceptional thinness are difficult...

... to the type Morrison and have yielded vertebrate remains and are almost certainly Jurassic. Succeeding these are two new formations, the Buckhorn conglomerate and Cedar Mountain shale, which have yielded no fossils but are tentatively classed as Lower Cretaceous, mainly by analogy with similar deposits...