File:Ferruginous quartz-pebble conglomerate (Newark Supergroup, Jurassic; Matawan, New Jersey, USA) (39868094640).jpg
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Conglomerate from the Jurassic of New Jersey, USA. (public display, Geology Department, Wittenberg University, Springfield, Ohio, USA) 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. Shown here is a conglomerate with quartz pebbles. Some conglomerates are feldspathic - they have an abundance of K-feldpar pebbles. Some conglomerates are lithic - they have an abundance of large clasts composed of a variety of other rock types. The dark coloration is this specimen is from iron oxides. The rock comes from the Newark Supergroup, an Upper Triassic to Lower Jurassic succession of siliciclastics-dominated rocks that fill a series of rift basins. Rift valleys formed during the Triassic, in what is now eastern North America, as the ancient Pangaea supercontinent attempted to break apart. The initial rifting failed, but a subsequent rifting event in the Jurassic was successful. Stratigraphy: Newark Supergroup, Jurassic Locality: unrecorded/undisclosed site at or near the town of Matawan, eastern New Jersey, USA For more info., see: <a href="https://en.wikipedia.org/wiki/Newark_Supergroup" rel="nofollow">en.wikipedia.org/wiki/Newark_Supergroup</a> |
| Date | |
| Source | Ferruginous quartz-pebble conglomerate (Newark Supergroup, Jurassic; Matawan, New Jersey, USA) |
| 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@N05/39868094640 (archive). It was reviewed on 6 December 2019 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 | 04:03, 6 December 2019 | | 2,403 × 2,388 (4.66 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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