File:Greenstone (Catoctin Formation, Neoproterozoic, ~555-568 Ma; between Waynesboro and Liberty Mills, Pennsylvania, USA) 4.jpg
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| Description |
English: Greenstone from the Precambrian of Pennsylvania, USA.
Greenstone is a crystalline-textured to weakly foliated metamorphic rock having the minerals chlorite, epidote, actinolite, and plagioclase feldspar. Greenstone usually forms by low- to intermediate-grade metamorphism of basalt. The sample seen here was formerly an amygdaloidal basalt, a vesicular basalt with secondary minerals filling the vesicles - in this case, light greenish-colored epidote. The rock comes from the Blue Ridge in the Appalachians of Pennsylvania. It's derived from the Catoctin Formation, a late Precambrian-aged succession of mostly mafic volcanic rocks interpreted to be metamorphosed continental flood basalts. Stratigraphy: Catoctin Formation (Catoctin Greenstone), Ediacaran, upper Neoproterozoic, 555-568 Ma (with error bars, = 551-572 Ma) Locality: Route 16 roadcut between Waynesboro (southeastern Franklin County) and Liberty Mills (southwestern Adams County), southern margin of Pennsylvania, USA |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/51186995798/ |
| 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@N05/51186995798. It was reviewed on 18 May 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 17:36, 18 May 2021 | | 4,000 × 3,000 (8.5 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/51186995798/ with UploadWizard |
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