Skip to Main Content
Book Chapter

Windward vs. leeward variability of faunal distribution in a Silurian (Wenlockian) pinnacle reef complex—Ray Reef, Macomb County, Michigan

By
Jennifer L. Trout
Jennifer L. Trout
Michigan Geological Repository for Research and Education, Western Michigan University, 1903 W. Michigan Avenue, Kalamazoo, Michigan 49008, USA
Search for other works by this author on:
G. Michael Grammer
G. Michael Grammer
Michigan Geological Repository for Research and Education, Western Michigan University, 1903 W. Michigan Avenue, Kalamazoo, Michigan 49008, USA, and Boone Pickens School of Geology, Oklahoma State University, 105 Nobel Research Center, Stillwater, Oklahoma 74078-3031, USA
Search for other works by this author on:
William B. Harrison III
William B. Harrison III
Michigan Geological Repository for Research and Education, Western Michigan University, 1903 W. Michigan Avenue, Kalamazoo, Michigan 49008, USA
Search for other works by this author on:
Published:
May 10, 2018
Publication history
09 June 201720 February 2018

ABSTRACT

Despite extensive research on Silurian (Niagaran–Wenlockian) reefs, most studies concerning faunal abundance and distribution have been qualitative studies with an emphasis on taxonomy, paleoecology, and evolution. This study is the first quantitative study of relative abundance and distribution of fauna throughout a single Wenlockian reef located in the southern trend of the Michigan Basin. Building on an established sequence stratigraphic framework with wind directions surmised from known paleogeographic location, the purpose of this study was threefold: (1) to quantitatively determine the relative abundances of fauna from subsurface cores of Ray Reef and show how they are tied to the established sequence stratigraphic framework; (2) to determine if the probable wind and current directions, along with water depth, influenced the morphology and distribution of fauna on the reef; and (3) to analyze the influence of wind and current on syndepositional marine cementation.

Relative faunal abundance differed among the leeward, windward, and reef crest locations. Overall faunal density was highest in the crest and lowest along the leeward side of the reef complex. Diversity was highest in the crestal portion of the reef complex and in the reef core facies, in general. Changes in faunal morphology and community replacement were seen repeatedly through all cores in association with shallowing-upward conditions, which coincided with third-order stratigraphic and higher-frequency sequence stratigraphic cyclicity. The percentage of syndepositional marine cement was highest on the windward side and lowest on the leeward side. As has been reported in other reef complexes of varying geological ages, results of this study indicate that the core of the Silurian reef was composed mostly of rubble or debris, relative to the smaller proportion of in situ fauna.

You do not currently have access to this article.

Figures & Tables

Contents

GSA Special Papers

Paleozoic Stratigraphy and Resources of the Michigan Basin

G. Michael Grammer
G. Michael Grammer
Search for other works by this author on:
William B. Harrison, III
William B. Harrison, III
Search for other works by this author on:
David A. Barnes
David A. Barnes
Search for other works by this author on:
Geological Society of America
Volume
531
ISBN electronic:
9780813795317
Publication date:
May 10, 2018

GeoRef

References

Related

Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal