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Conodont paleoecology and biofacies analysis of the Lower Triassic Thaynes Formation in the Cordilleran Miogeocline

Timothy R. Carr, Rachel K. Paull and David L. Clark
Conodont paleoecology and biofacies analysis of the Lower Triassic Thaynes Formation in the Cordilleran Miogeocline (in Conodont biofacies and provincialism, David L. Clark (editor))
Special Paper - Geological Society of America (1984) 196: 283-293

Abstract

The Lower Triassic (Smithian) Thaynes Formation represents a broad spectrum of paleoenvironments. Samples collected along a depth-related gradient from tidal flats to a relatively deep, commonly dysaerobic, basin yielded an abundant conodont fauna. Simple chi-square tests and multivariate analyses using six conodont entities indicate the presence of three distinctive biofacies related to the general environmental gradient. The restricted inner shelf is characterized by PARACHIROGNATHUS: The outer shelf is distinguished by a diverse conodont fauna including FURNISHIUS: Basinward, the low diversity conodont fauna is dominated by species of NEOGONDOLELLA: Some Early Triassic conodonts such as Neospathodus are ubiquitous and provide the best foundation for inter-basinal conodont zonation. Correlation of assemblages with corresponding position along an environmental gradient defined on lithologic criteria indicates that quantitative measures of conodont faunas are potentially useful in the analysis of paleogeography and changes in relative position of sea level.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 196
Title: Conodont paleoecology and biofacies analysis of the Lower Triassic Thaynes Formation in the Cordilleran Miogeocline
Title: Conodont biofacies and provincialism
Author(s): Carr, Timothy R.Paull, Rachel K.Clark, David L.
Author(s): Clark, David L.editor
Affiliation: ARCO Oil and Gas Co., Geol. Res., Dallas, TX, United States
Affiliation: Univ. Wis. Madison, Dep. Geol. and Geophys., Madison, WI, United States
Pages: 283-293
Published: 1984
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
ISBN: 0-8137-2196-2
Meeting name: Pander Society symposium ; conodont biofacies and provincialism
Meeting location: Madison, WI, USA, United States
Meeting date: 19830428Apr. 28-30, 1983
References: 48
Accession Number: 1985-041032
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, geol. sketch maps
Secondary Affiliation: Univ. Wis.-Madison, Dep. Geol. and Geophys. Sci., USA, United StatesUniv. Wis.-Milwaukee, Dep. Geol. and Geophys., USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1985
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