Skip to Main Content
Skip Nav Destination
GEOREF RECORD

Tidal-flat to shallow-shelf deposits in the Cap Mountain Limestone Member of the Riley Formation, Upper Cambrian of central Texas

David T. King and Henry S. Chafetz
Tidal-flat to shallow-shelf deposits in the Cap Mountain Limestone Member of the Riley Formation, Upper Cambrian of central Texas
Journal of Sedimentary Petrology (March 1983) 53 (1): 261-273

Abstract

The terrigenous and carbonate facies accumulated in an overall transgressive-regressive sequence. Terrigenous strata are most abundant in the northern and western parts of the area and are divisible into three facies. The low-angle cross stratified very fine sandstone to coarse siltstone facies is an arkose. Sedimentary structures in this facies include: terrigenous-carbonate flaser bedding, vertical burrows, symmetrical and asymmetrical ripples, convoluted and microfaulted laminae, desiccation cracks, and clay drapes. The fine-to-medium sandstone facies displays a quartz-rich, fossiliferous, and intraclastic texture, and exhibits bipolar trough cross-stratification directions. The bioturbated very fine sandstone to coarse siltstone facies, is an arkose. This facies exhibits some terrigenous-carbonate wavy and lenticular bedding. The freshness and abundance of feldspars in the tidal flat and adjacent areas, lack of abundant clay, and salt hopper impressions in clay drapes suggest that arid to semi-arid conditions existed in the source area and that eolian processes provided a high percentage of the terrigenous sediment to the area. The carbonate strata have three facies that are distinguished by their allochemical constituents; the brachiopod-trilobite-pelmatazoan biomicrite facies, the sponge megasclere biomicrite facies, and the oosparite facies. The depositional history of the transgressive Cap Mountain Limestone may be subdivided into two phases, an extensive tidal flat cut by migrating tidal channels and in adjacent, broad, shallow subtidal areas, and shallow subtidal areas, a shallow shelf, sponge organic banks, and oolite shoals.--Modified journal abstract.


ISSN: 0022-4472
Coden: JSEPAK
Serial Title: Journal of Sedimentary Petrology
Serial Volume: 53
Serial Issue: 1
Title: Tidal-flat to shallow-shelf deposits in the Cap Mountain Limestone Member of the Riley Formation, Upper Cambrian of central Texas
Affiliation: Auburn Univ., Dep. Geol., Auburn, AL, United States
Pages: 261-273
Published: 198303
Text Language: English
Publisher: Society of Economic Paleontologists and Mineralogists, Tulsa, OK, United States
References: 29
Accession Number: 1983-039453
Categories: Sedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, block diag., sect., strat. col., sketch map
N30°13'00" - N31°00'00", W98°30'00" - W98°10'00"
Secondary Affiliation: Univ. Houston, Dep. Geosci., USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1983
Close Modal

or Create an Account

Close Modal
Close Modal