File:Dolostone breccia (Mackinac Breccia, Devonian; Interstate-75 exit near St. Ignace, Upper Peninsula of Michigan, USA) 2 (40975889854).jpg
_2_(40975889854).jpg){kind=small}
Original file (3,343 × 1,966 pixels, file size: 4.76 MB, MIME type: image/jpeg)
 | This is a file from the Wikimedia Commons. Information from its description page there is shown below. Commons is a freely licensed media file repository. You can help. |
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 |
Licensing
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
|
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. |
File history
Click on a date/time to view the file as it appeared at that time.
| 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 |
_2_(40975889854).jpg){kind=link}