File:Limestone paleocobble (Kope Formation, Upper Ordovician; Aurora, Indiana, USA).jpg

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Captions

Captions

Limestone paleocobble (Kope Formation, Upper Ordovician; Aurora, Indiana, USA)

Summary

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Description
English: Limestone paleocobble from the Ordovician of Indiana, USA.

This rock is from the famous Cincinnatian Series of the tristate area of Ohio-Kentucky-Indiana. Rocks in the Cincinnatian were deposited in relatively shallow marine facies during the Late Ordovician. The Cincinnatian succession is mostly interbedded limestones and shales. Most of the limestones are event beds (= tempestites), deposited during ancient storms.

The specimen is a paleocobble composed of lime mudstone - it was originally a loose clast on an ancient Cincinnatian seafloor. Such rocks are also called mobile hardgrounds. Organisms that occupy cobble substrates include various encrusters and borers (the flip side of this sample has preserved encrusters).

Stratigraphy: float from the lower Kope Formation, lower Edenian Stage, lower Cincinnatian Series, Upper Ordovician

Locality: Aurora cobble cut - construction site and cut wall immediately west of & adjacent to the intersection of Florence Drive & Route 50, just northeast of the town of Aurora & southwest of Lawrenceburg, southeastern Dearborn County, southeastern Indiana, USA (39° 04' 47.87" North latitude, 84° 53' 12.03" West longitude)
Date
Source https://www.flickr.com/photos/jsjgeology/49999845018/
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/49999845018. It was reviewed on 16 April 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

16 April 2022

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