Publication Date


Document Type


First Advisor

Weiss, Malcolm P. (Malcolm Pickett), 1921-

Degree Name

M.S. (Master of Science)

Legacy Department

Department of Geology


Geology; Stratigraphic--Cretacious; Geology--Utah; Geology; Stratigraphic--Jurassic


Sequences of interbedded conglomerates, sandstones, variegated mudstones, and minor limestone, previously mapped as Jurassic Morrison (?) Formation, are exposed along the east front of the Gunnison Plateau in central Utah. A thick stratigraphic section on the southeast corner of the plateau can be divided into two formations. The lower half of the section is characterized by red/gray variegated mudstones - containing limestone nodules, with lenses of red and gray sandstones, minor red conglomerates, and freshwater limestone. This lower part is lithically correlative with the Lower Cretaceous Cedar Mountain Formation of the San Rafael Swell. The upper half of the section is characterized by the predominance of red pebble-to-boulder conglomerates with interbedded sandstones and mudstones similar to those in the lower half of the section. This upper part represents a newly recognized basal lithofacies of the Upper Cretaceous Indianola Group (u) because Cenomanian palynomorphs occur near its base. Outcrops of these units elsewhere along the east front of the Gunnison Plateau are fragmentary and severely deformed. Thus with similar lithofacies in both the unnamed basal unit of the Indianola Group and in the Cedar Mountain Formation, these exposures are best mapped as Cretaceous (undifferentiated).


Bibliography: pages 140-143.


vii, 176 pages




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