File:Spokane Sapphire Mine (near Helena, Montana, USA) 23.jpg
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| Description |
English: Fluvial deposits are sedimentary layers laid down in fluvial systems - rivers and streams. In the channel facies, deposits are usually poorly sorted and cross-bedded. In the ancient rock record, channel deposits are typically sandstones and conglomerates. In the floodplain facies, deposits are usually fine-grained - in other words, mud. With burial and lithification, floodplain deposits become horizontally layered shales, maybe with mudcracks and occasional plant fossils, representing growth between flood events.
Seen here is a small quarry along the Missouri River in Montana. The target material is a sapphire-bearing, Pleistocene-aged river terrace gravel deposit. A relatively thin layer of regolith ("dirt") occurs above the fluvial gravel. Locality: small quarry at the Spokane Gravel Bar, southern slopes of the Missouri River Valley, northeast of the town of Helena, southeastern Lewis and Clark County, western Montana, USA (46° 39’ 40.74” North latitude, 111° 48’ 37.49” West longitude) |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/51358652463/ |
| 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@N05/51358652463. It was reviewed on 6 August 2021 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 | |
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| current | 16:11, 6 August 2021 | | 3,816 × 2,530 (6.3 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/51358652463/ with UploadWizard |
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