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GEOREF RECORD

Carbonate deposits in the Lower Jurassic Navajo Sandstone, southern Utah and northern Arizona, U.S.A.

Judith Totman Parrish, Stephen T. Hasiotis and Marjorie A. Chan
Carbonate deposits in the Lower Jurassic Navajo Sandstone, southern Utah and northern Arizona, U.S.A.
Journal of Sedimentary Research (July 2017) 87 (7): 740-762

Abstract

Carbonate strata constitute a minor proportion of the widespread eolian Lower Jurassic Navajo Sandstone but are vital for understanding the hydrological and paleoecological dynamics of the erg system. The carbonate lithologies are in the form of tufa (carbonate spring) mounds and lacustrine beds, predominantly limestone and/or dolomite with minor constituents of chert and clastics. The tufa mounds and lacustrine carbonate beds occur separately or together; where together, the springs are interpreted to have sourced water to the lakes. Where they are not associated with tufa mounds, the lacustrine carbonate beds may have formed where the water table intersected the topographic surface through seepage. Many of the deposits exhibit three common characteristics: (1) clastic facies in the carbonate beds that indicate proximity to the lake margin; (2) deformation of the lower beds of the carbonate units by catastrophic dewatering events; and (3) a variety of weathering features and evaporite crystal molds that indicate periodic subaerial exposure. These deposits were also the habitats of a rich terrestrial biota, including vertebrates, aquatic and terrestrial invertebrates, and plants, including large trees. In addition to the tufa mounds, several other mound-like structures occur in the carbonate beds as stromatolite mounds, carbonate beds draped over primary topography, tepee structures, and accumulations around tree trunks.


ISSN: 1527-1404
EISSN: 1938-3681
Serial Title: Journal of Sedimentary Research
Serial Volume: 87
Serial Issue: 7
Title: Carbonate deposits in the Lower Jurassic Navajo Sandstone, southern Utah and northern Arizona, U.S.A.
Affiliation: University of Idaho, Department of Geological Sciences, Moscow, ID, United States
Pages: 740-762
Published: 201707
Text Language: English
Publisher: Society for Sedimentary Geology, Tulsa, OK, United States
References: 31
Accession Number: 2017-091990
Categories: Sedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., 2 tables, sketch maps
N38°30'00" - N39°31'00", W110°13'00" - W109°02'60"
N34°15'00" - N37°00'00", W113°19'60" - W110°45'00"
N37°55'00" - N38°30'00", W110°10'00" - W109°40'00"
Secondary Affiliation: University of Kansas, USA, United StatesUniversity of Utah, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute.
Update Code: 201722
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