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Signatures of sea-level rise on the carbonate margin of a Late Ordovician foreland basin; a case study from the Cincinnati Arch, USA

Patrick I. McLaughlin and Carlton E. Brett
Signatures of sea-level rise on the carbonate margin of a Late Ordovician foreland basin; a case study from the Cincinnati Arch, USA (in Sea level change and the structure of marine ecosystems, Stefano Dominici (editor) and Martin Zuschin (editor))
Palaios (May 2007) 22 (3): 245-267

Abstract

Analysis of the limestone-dominated Upper Ordovician (Chatfieldian-Edenian) Point Pleasant-Fulton interval provides detailed documentation of the internal composition of a transgressive systems tract within a mixed-carbonate siliciclastic foreland basin succession. This 14 m interval is divisible into 13 small-scale cycles that are widely traceable and record a lithofacies gradient from calcarenite-rich outcrops of central Kentucky into interbedded fine-grained grainstones and organic-rich shale in the subsurface of western Ohio. Hardgrounds and condensed beds are widespread and numerous and commonly cap the limestone hemicycle of small-scale cycles. Taphonomic- and faunal-gradient analyses of 233 bedding planes reveal both lateral and vertical gradients indicative of deepening from central Kentucky northward and a similar signature of deepening upward through the study interval. The deepening-upward trend within the Point Pleasant member is coincident with a decrease in the thickness of shale hemicycles, whereas the deepening-upward trend within the Fulton submember shows a slight increase in shale hemicycle thickness and quartz silt content. A polymictic intraformational conglomerate, the most complex discontinuity surface within the study interval, marks the contact of the Point Pleasant-Fulton members. The study interval, thus, is interpreted to represent distinctive early and late phases (Point Pleasant and Fulton members, respectively) of the transgressive systems tract separated by a maximum starvation surface. These patterns suggest that this widespread limestone-dominated interval formed primarily in response to basinwide, relative sea-level rise and siliciclastic sediment starvation, rather than simply through winnowing.


ISSN: 0883-1351
Serial Title: Palaios
Serial Volume: 22
Serial Issue: 3
Title: Signatures of sea-level rise on the carbonate margin of a Late Ordovician foreland basin; a case study from the Cincinnati Arch, USA
Title: Sea level change and the structure of marine ecosystems
Author(s): McLaughlin, Patrick I.Brett, Carlton E.
Author(s): Dominici, Stefanoeditor
Author(s): Zuschin, Martineditor
Affiliation: Bucknell University, Geology Department, Lewisburg, PA, United States
Affiliation: Universita di Firenze, Sezione Geologia e Paleontologia, Florence, Italy
Pages: 245-267
Published: 20070501
Text Language: English
Publisher: Society for Sedimentary Geology, Tulsa, OK, United States
Meeting name: American Association of Petroleum Geologists meeting, session on Sea-level change, climate variation, and the restructuring of shallow marine communities
Meeting location: Dallas, TX, USA, United States
Meeting date: 20040418April 18-21, 2004
References: 67
Accession Number: 2007-053306
Categories: Stratigraphy
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., strat. cols., sketch map
N37°30'00" - N39°30'00", W85°00'00" - W83°30'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by SEPM (Society for Sedimentary Geology), Tulsa, OK, United States
Update Code: 200728
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