File:Glover Bluff Impact Breccia (Oneota Formation, Lower Ordovician; Glover Bluff Impact Structure, south-central Wisconsin).jpg
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English: Glover Bluff Impact Breccia (field of view 11.9 centimeters across) - it’s not well known that south-central Wisconsin was the site of a significant meteorite impact during the Early Ordovician. The Glover Bluff Impact Crater in northern Marquette County, Wisconsin is not well-defined in terms of its size. Size estimates vary from 8 to 22 km in diameter.
The age of the impact is fairly well constrained by the presence of an impact breccia (fallback breccia) in the Oneota Formation, which is below the Sauk-Tippecanoe Measequence boundary (Prairie du Chien Group, Lower Ordovician). The Glover Bluff impact breccia is a multicolored jumble of angular fragments in a reddish matrix. |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/14609907789/ |
| 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@N05/14609907789. It was reviewed on 3 December 2020 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 | 19:54, 3 December 2020 | | 1,428 × 800 (1.18 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/14609907789/ with UploadWizard |
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