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Golden olden days of the Ordovician, Silurian Seas, and Pleistocene Ice: An introduction to the geology of the Dayton, Ohio, area

By
Michael R. Sandy
Michael R. Sandy
Department of Geology, University of Dayton, 300 College Park, Dayton, Ohio 45469-2364, USA
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Published:
January 01, 2012

Abstract

This article is aimed at providing an overview of the geology of the Dayton region to those who seek an introduction to Dayton’s geological story. The oldest rocks exposed in the area are Ordovician (Katian Stage, Cincinnatian Series in local North American usage) in age, and are world famous for the quantity and quality of their fossils. Unconformably overlying the Ordovician strata are Silurian (Llandovery–Wenlock Series) dolomites, limestones, and shales, which represent tropical seas that were at times rich in crinoids, corals, brachiopods, and other invertebrates. A large time gap (unconformity) in the rock record of some 420+ million years occurs between the Silurian and the Pleistocene “Ice Age” deposits of the area. Significant changes to the natural environment in the Dayton area have occurred during the Anthropocene.

A number of localities that can be reached within about 30–40 minutes from downtown Dayton are described. This is effectively Montgomery County and adjacent counties. As such this treatment is brief and not meant as a compendium but as an introduction and outline of Dayton’s geology and geological history. The localities selected illustrate Dayton’s geological heritage, from the Ordovician to the Pleistocene, while several of the area’s distinctive natural landmarks are discussed. A number of the landforms are expressions of the Niagara Escarpment, where resistant Silurian limestones and dolomites overlie less resistant older rocks.

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Contents

GSA Field Guide

On and around the Cincinnati Arch and Niagara Escarpment

Michael R. Sandy
Michael R. Sandy
Department of Geology University of Dayton Dayton, Ohio 45469-2364 USA
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Daniel Goldman
Daniel Goldman
Department of Geology University of Dayton Dayton, Ohio 45469-2364 USA
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Geological Society of America
Volume
27
ISBN electronic:
9780813756271
Publication date:
January 01, 2012

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