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The AAPG/Datapages Combined Publications Database
Utah Geological Association
Abstract
Stratigraphic Interpretations of Triassic and Jurassic Beds, Henry Mountains Area
Abstract
The Triassic and Jurassic Systems are represented in the Henry Mountains by a varied assemblage of dominantly continental beds. These can be classified in several natural sedimentological groups according to dominant types of rock and environments of formation: (1) The Early Triassic Moenkopi Group, (Black Dragon, Sinbad, Torrey, and Moody Canyon members) chiefly redbeds of marginal marine and deltaic origin, about 400 ft thick; (2) The Chinle Group, (Moss Back, Shinarump, Monitor Butte, Petrified Forest, Owl Rock and Church Rock members) consistituting a variegated assemblage of continental rocks with an aggregate average thickness of about 800 ft; (3) The Glen Canyon Group, (Wingate, Kayenta, Navajo-Page) dominantly cross-bedded sandstone, Wingate and Navajo are generally considered to be of eolian origin, thickness about 1300 ft; (4) The San Rafael Group, (Carmel, Entrada, Curtis and Summerville formations) dominantly marginal marine with both eolian and subaqucous facies, thickness about 1500 ft; (5) Morrison Formation, (Salt Wash and Brushy Basin members) fluvial and lacustrine, thickness about 550 ft. The Chinle and Morrison formations are important sources of uranium in the Henry Mountains.
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