File:East River Valley & Gothic Mountain (Gunnison County, Colorado, USA) 3.jpg
Original file (4,032 × 2,478 pixels, file size: 5.01 MB, MIME type: image/jpeg)
Captions
Captions
Summary
[edit]| Description |
English: (photo by Kira Harris)
The is the East River Valley (upstream is to the right) in the Rocky Mountains of Colorado, near the towns of Aspen and Crested Butte. The prominent peak is Gothic Mountain. The bedrock flooring the valley is the Mancos Shale, a thick, widespread, dark-colored, deep-water marine shale unit of Late Cretaceous age. Outcrops occur in Colorado, Utah, Arizona, and New Mexico. The formation ranges from sparsely fossiliferous shales to fossiliferous calcareous shales. The Mancos Shale has an intertonguing relationship with the Dakota Sandstone - many sections have coarse-grained siliciclastic intervals broadly interbedded with fine-grained siliciclastics. Cretaceous-aged marine deposits are widespread in western North America - they represent sedimentation during a sea level highstand. During the Cretaceous, global sea level was so high that an ocean (the Western Interior Seaway) separated eastern and western North America. The Cretaceous transgression was a result of relatively rapid seafloor spreading rates (tectonic divergence) in some oceans basins. This lifted considerable portions of the seafloor, which raised global sea levels. The Mancos Shale is a non-weathering resistant unit and often forms distinctive, mottled grayish badlands (e.g., see: www.flickr.com/photos/jsjgeology/29534563934). "Badlands" refers to a landscape unsuitable for farming. Such terrains are complexly dissected (eroded), have steep slopes, relatively soft rocks (usually shale), little to no soil, and little to no vegetation. Gothic Mountain has soft Mancos Shale outcrops in its lower slopes. The middle and upper portions of the mountain have igneous rocks in the form of a large sill and a large laccolith. These contain relatively hard, weathering-resistant rocks, resulting in steep to very steep slopes. Gothic Mountain tops out at 12,625 feet elevation, according to the United States Geological Survey Oh-Be-Joyful 7.5' topographic quadrangle map. The buildings are part of the Rocky Mountain Biological Laboratory, a field station built on the site of an old, abandoned mining town called Gothic. Locality: East River Valley at Gothic Mountain, northern Gunnison County, West Elk Mountains section of the Southern Rocky Mountains, western Colorado, USA See info. at: en.wikipedia.org/wiki/West_Elk_Mountains and en.wikipedia.org/wiki/East_River_(Colorado) and en.wikipedia.org/wiki/Gothic_Mountain and en.wikipedia.org/wiki/Rocky_Mountain_Biological_Laboratory |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/46871120842/ |
| Author | James St. John |
| Camera location |   | View this and other nearby images on: OpenStreetMap |  |
|---|
Licensing
[edit]
- 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@N05/46871120842. It was reviewed on 18 October 2020 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 | 01:38, 18 October 2020 | 4,032 × 2,478 (5.01 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/46871120842/ with UploadWizard |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.