Award Date

1-1-1997

Degree Type

Thesis

Degree Name

Master of Science (MS)

Department

Geoscience

Number of Pages

178

Abstract

In the Grand Canyon and Lake Mead areas of Nevada, Arizona and Utah, there is a light-colored dolomite succession that conformably overlies the Cambrian Muav Limestone; McKee (1945) referred to these rocks as undifferentiated Cambrian dolomites, and their age and correlation have remained uncertain. Seven stratigraphic sections were studied, including those at Quartermaster Canyon, Mile-269 Canyon, Diamond Bar Ranch, Devil's Cove, Tramp Ridge, Whitney Ridge, and Frenchman Mountain. The thickness of the undifferentiated dolomites increases to the west from 78 meters at Diamond Bar Ranch to 371 meters at Frenchman Mountain. In the Grand Canyon area, the undifferentiated dolomites are unconformably overlain by Devonian rocks, while in craton-margin sections the undifferentiated dolomites are conformably overlain by the Upper Cambrian Nopah Formation; Within the undifferentiated dolomites eight depositional facies were established: (1) burrow-mottled facies; (2) flat-pebble grainstone facies; (3) stromatolite facies; (4) oolitic-grainstone facies; (5) bioclastic-grainstone facies; (6) ribbon-rock facies; (7) nodular facies; and (8) laminite facies. The depositional environment represented by each facies was established; I identified seven depositional sequences within the undifferentiated dolomite succession. (Abstract shortened by UMI.).

Keywords

Area; Arizona; Cambrian; Canyon; Correlation; Dolomites; Grand Canyon; Lake; Mead; Lake Mead; Nevada; Sedimentology; Sequences; Stratigraphy; Undifferentiated; Utah

Controlled Subject

Geology

File Format

pdf

File Size

4802.56 KB

Degree Grantor

University of Nevada, Las Vegas

Language

English

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