File:Brallier shale, Huntingdon County, Pennsylvania (Butc1163).jpg
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Summary
editDescriptionBrallier shale, Huntingdon County, Pennsylvania (Butc1163).jpg |
English: Brallier shale, these thick beds are thinly laminated and break down into thin chips on weathering. Cut on Pennsylvania railroad about half a mile east of Huntingdon, looking north. Huntingdon County, Pennsylvania. 1924. Plate 20 in U.S. Geological Survey. Folio 227. 1945. The text of the report refers to this plate as follows: The Brallier is predominantly a pale greenish-gray micaceous, sandy, and slaty shale, generally cleaving easily into thin laminae, but there are thin layers of coarser texture and less perfect cleavage. In railroad cuts half a mile east of Huntingdon very evenly bedded layers 1 to 2 feet thick appear, in their unweathered condition, to be fine-grained compact sandstone (pl. 20), but on weathering these beds reveal their thin lamination cleavage and ultimately break down to small, thin plates. The rock is really a stiff sandy shale. |
Date | |
Source | Brallier shale, these thick beds are thinly laminated and break down into thin chips on weathering. Huntingdon County, Pennsylvania. 1924, USGS Denver Library Photographic Collection |
Author | USGS |
Licensing
editPublic domainPublic domainfalsefalse |
This image is in the public domain in the United States because it only contains materials that originally came from the United States Geological Survey, an agency of the United States Department of the Interior. For more information, see the official USGS copyright policy.
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current | 20:54, 1 July 2022 | 4,373 × 3,177 (9.4 MB) | Jstuby (talk | contribs) | Uploaded a work by USGS from [https://library.usgs.gov/photo/#/item/51dc2510e4b0f81004b78f60 Brallier shale, these thick beds are thinly laminated and break down into thin chips on weathering. Huntingdon County, Pennsylvania. 1924], USGS Denver Library Photographic Collection with UploadWizard |
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Orientation | Normal |
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Horizontal resolution | 940 dpi |
Vertical resolution | 940 dpi |
Software used | Adobe Photoshop 7.0 |
File change date and time | 15:00, 3 March 2020 |
Color space | Uncalibrated |