File:Pillow basalts (Franciscan Complex, Jurassic; Point Bonita, California, USA) 2 (46348256815).jpg
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Summary
editDescriptionPillow basalts (Franciscan Complex, Jurassic; Point Bonita, California, USA) 2 (46348256815).jpg |
Pillow basalts in the Jurassic of California, USA. The bulbous, rounded masses of volcanic rock seen here are pillow basalts. The morphology is diagnostic of underwater lava eruptions. These rocks are part of the Franciscan Complex - they represent the top portion of Jurassic-aged oceanic crust. This basaltic crust originally formed at an ancient mid-ocean ridge and got plastered onto the edge of the North American continent along a now-inactive subduction zone. The upper portions of the subducting oceanic slab (the Farallon Plate) got scraped off to form an accretionary wedge. The basalts have been metamorphosed into greenstone, but much of the outcrop is still dark gray to black in color. The reddish areas at right are encrusting algae/lichen called Trentepohlia. Stratigraphy: Franciscan Complex, Jurassic Locality: Point Bonita, southwestern tip of the Marin Peninsula, Golden Gate National Recreation Area, north of San Francisco, coastal-western California, USA |
Date | |
Source | Pillow basalts (Franciscan Complex, Jurassic; Point Bonita, California, USA) 2 |
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@N05/46348256815 (archive). It was reviewed on 10 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
10 October 2019
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current | 00:23, 10 October 2019 | 1,944 × 2,592 (4.15 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Camera manufacturer | Canon |
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ISO speed rating | 10,763 |
Date and time of data generation | 16:22, 12 July 2010 |
Lens focal length | 6 mm |
Width | 1,944 px |
Height | 2,592 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 21:47, 2 March 2019 |
Y and C positioning | Centered |
Exif version | 2.2 |
Date and time of digitizing | 16:22, 12 July 2010 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 7.3125 |
APEX aperture | 4 |
APEX exposure bias | 0 |
Maximum land aperture | 2.875 APEX (f/2.71) |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
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File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
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Digital zoom ratio | 1 |
Scene capture type | Standard |
Lens used | 1.1-6.5 mm |
Date metadata was last modified | 16:47, 2 March 2019 |
Unique ID of original document | 82CFCC406893A902490CFD6411E25FEF |
IIM version | 18,755 |