File:Dolostone breccia (Mackinac Breccia, Devonian; Interstate-75 exit near St. Ignace, Upper Peninsula of Michigan, USA) 2 (40975889854).jpg
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Summary
| Description |
Breccia from the Devonian of Michigan, USA. (public display, Geology Department, Wittenberg University, Springfield, Ohio, USA) This rock is a Devonian-aged dolostone breccia called the Mackinac Breccia. It is exposed in the vicinity of Castle Rock, Michigan. In that area, the unit is a dolostone block breccia - it's principally a jumble of broken blocks of dolostone derived from the St. Ignace Dolomite (upper Upper Silurian). The breccia represents deposition from many collapse events in paleocaverns of dissolved-out Salina Group evaporites (Upper Silurian). Post-Silurian collapse of dissolved-out Salina evaporites was a widespread phenomenon throughout the Michigan-Ohio region. Stratigraphy: Mackinac Breccia, upper Lower Devonian to lower Middle Devonian Locality: outcrop attributed to an Interstate-75 exit near St. Ignace, Upper Peninsula of Michigan, USA For info. on the Mackinac Breccia, see: Landes (1959) - The Mackinac Breccia. pp. 19-24 in Geology of Mackinac Island and Lower and Middle Devonian South of the Straits of Mackinac. Michigan Basin Geological Society. |
| Date | |
| Source | Dolostone breccia (Mackinac Breccia, Devonian; Interstate-75 exit near St. Ignace, Upper Peninsula of Michigan, USA) 2 |
| Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/40975889854 (archive). It was reviewed on 7 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 19:06, 7 December 2019 | | 3,343 × 1,966 (4.76 MB) | Ser Amantio di Nicolao | Transferred from Flickr via #flickr2commons |
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