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GEOREF RECORD

Pseudo rib-and-furrow marks in the Chugwater (Triassic) Formation of west-central Wyoming

M. Dane Picard and Lee R. High
Pseudo rib-and-furrow marks in the Chugwater (Triassic) Formation of west-central Wyoming
Contributions to Geology (1964) 3 (1): 27-31

Abstract

Ripple marked surfaces with the same surface expression as rib-and-furrow marks are found in the Chugwater Formation of Wyoming, but the paleocurrent directions obtained from these two current direction indicators are mutually perpendicular. These pseudo rib-and-furrow marks are apparently the result of truncation of ripple marks in which the crests of the laminae forming the ripple mark and the crest of the ripple mark are not parallel. The mechanism (or mechanisms) which produced this angular difference is unknown. Observations of the Chugwater structures suggest that rib-and-furrow marks and pseudo rib-and-furrow marks originate in several ways, and that their usefulness as a paleocurrent direction indicator depends on their mode of formation and their relationship to other paleocurrent direction indicators.


ISSN: 0010-7980
Coden: WUGGAO
Serial Title: Contributions to Geology
Serial Volume: 3
Serial Issue: 1
Title: Pseudo rib-and-furrow marks in the Chugwater (Triassic) Formation of west-central Wyoming
Pages: 27-31
Published: 1964
Text Language: English
Publisher: University of Wyoming, Laramie, WY, United States
Accession Number: 1964-012949
Categories: Geomorphology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N41°00'00" - N45°00'00", W111°04'60" - W104°04'60"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States
Update Code: 1964
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