File:Pillow basalts (Franciscan Complex, Jurassic; Point Bonita, Marin Peninsula, Golden Gate National Recreational Area, western coast of California, USA) (15896595665).jpg
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DescriptionPillow basalts (Franciscan Complex, Jurassic; Point Bonita, Marin Peninsula, Golden Gate National Recreational Area, western coast of California, USA) (15896595665).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. 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, Marin Peninsula, Golden Gate National Recreational Area, western coast of California, 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@N05/15896595665 (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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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 00:14, 10 October 2019 | 960 × 714 (317 KB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Orientation | Normal |
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Horizontal resolution | 96 dpi |
Vertical resolution | 96 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 02:48, 28 November 2014 |
Color space | Uncalibrated |
Image width | 960 px |
Image height | 714 px |
Date and time of digitizing | 20:52, 23 November 2010 |
Date metadata was last modified | 21:48, 27 November 2014 |