File:Conglomerate (Tokio Formation, Upper Cretaceous, ~85 Ma; Crater of Diamonds State Park, Arkansas, USA) 1.jpg
Original file (1,044 × 1,005 pixels, file size: 1.58 MB, MIME type: image/jpeg)
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Summary
editDescriptionConglomerate (Tokio Formation, Upper Cretaceous, ~85 Ma; Crater of Diamonds State Park, Arkansas, USA) 1.jpg |
English: Conglomerate (lithic conglomerate) from the Cretaceous of Arkansas, USA. (8.0 centimeters across at its widest)
Sedimentary rocks form by the solidification of loose sediments. Loose sediments become hard rocks by the processes of deposition, burial, compaction, dewatering, and cementation. There are three categories of sedimentary rocks: 1) Siliciclastic sedimentary rocks form by the solidification of sediments produced by weathering & erosion of any previously existing rocks. 2) Biogenic sedimentary rocks form by the solidification of sediments that were once-living organisms (plants, animals, micro-organisms). 3) Chemical sedimentary rocks form by the solidification of sediments formed by inorganic chemical reactions. Most sedimentary rocks have a clastic texture, but some are crystalline. Conglomerate is a siliciclastic sedimentary rock consisting of a mix of large & small grains - it is poorly sorted. The larger grains (pebbles or cobbles or boulders) in conglomerates are rounded to subrounded in shape. The finer-grained matrix is usually sand or mud. Most conglomerates were deposited in stream/river environments or alluvial fan environments or some very shallow marine environments. Seen here is a lithic conglomerate that is dominated by subrounded to subangular lithic pebbles and sand. This is from a lithified gravel unit that caps a famous Cretaceous-aged diamondiferous lamproite diatreme in Arkansas - the Prairie Creek Lamproite. Stratigraphy: Tokio Formation, Upper Cretaceous, ~85 Ma Locality: Crater of Diamonds State Park, southern Pike County, southwestern Arkansas, USA |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/16763943876/ |
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@N05/16763943876. It was reviewed on 26 March 2024 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
26 March 2024
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current | 20:02, 26 March 2024 | 1,044 × 1,005 (1.58 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/16763943876/ with UploadWizard |
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This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Width | 1,061 px |
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Height | 1,016 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 350 dpi |
Vertical resolution | 350 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 21:43, 11 March 2015 |
Exif version | 2.21 |
Color space | sRGB |
Unique ID of original document | 78168C1074D09F13D478AC7B7C2EF53D |
Date and time of digitizing | 17:42, 11 March 2015 |
Date metadata was last modified | 17:43, 11 March 2015 |