File:Fault in ribbon cherts (Franciscan Complex, Lower Jurassic-Lower Cretaceous; Rodeo Lagoon North Quarry, California, USA) 8.jpg
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[edit]DescriptionFault in ribbon cherts (Franciscan Complex, Lower Jurassic-Lower Cretaceous; Rodeo Lagoon North Quarry, California, USA) 8.jpg |
English: Fault in ribbon cherts in the Mesozoic of California, USA.
These rocks are tectonically tilted layers of chert. The color is from hematite (Fe2O3 - iron oxide). Weathering of these chert beds results in a ribbon-like appearance, hence the term ribbon chert. Chert is a siliceous sedimentary rock, composed of cryptocrystalline quartz (SiO2). These particular cherts have abundant microfossils of radiolarians, a group of marine, unicellular, non-photosynthesizing protists that make tiny skeletons of opal (SiO2·nH2O). Burial and diagenesis of radiolarian-rich sediments results in the formation of radiolarian cherts. These rocks are part of the Franciscan Complex (Jurassic) and were deposited on an ancient deep seafloor. The rocks got scraped from the top of a subducting slab of oceanic crust (the Farallon Plate) along coastal California. The left-to-right fracture that offsets the beds is a minor fault. Locality: Rodeo Lagoon North Quarry - small inactive quarry on the northern side of Bunker Road, northern side of Rodeo Lagoon, southwestern Marin Peninsula, western-coastal California, USA (37° 49' 56.57" North latitude, 122° 31' 44.99" West longitude) |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/47179253382/ |
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@N05/47179253382. It was reviewed on 2 December 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
2 December 2020
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current | 15:38, 2 December 2020 | ![]() | 3,008 × 2,000 (4.32 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/47179253382/ with UploadWizard |
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Date and time of data generation | 13:41, 12 July 2010 |
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Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
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File change date and time | 15:17, 27 February 2019 |
Y and C positioning | Co-sited |
Exposure Program | Not defined |
Exif version | 2.21 |
Date and time of digitizing | 13:41, 12 July 2010 |
Meaning of each component |
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APEX exposure bias | 0 |
Maximum land aperture | 4.8 APEX (f/5.28) |
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Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 135 mm |
Scene capture type | Standard |
Scene control | None |
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Serial number of camera | 200638ad |
Lens used | 18.0-200.0 mm f/3.5-5.6 |
Date metadata was last modified | 10:17, 27 February 2019 |
Unique ID of original document | D00C9B67D4D9C12AEB01CDE0BE998824 |
IIM version | 1 |