File:Moro Rock exfoliation dome (Giant Forest Granodiorite, mid-Cretaceous, 97-102 Ma; Sequoia National Park, California, USA) 1 (16179631303).jpg
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Summary
editDescriptionMoro Rock exfoliation dome (Giant Forest Granodiorite, mid-Cretaceous, 97-102 Ma; Sequoia National Park, California, USA) 1 (16179631303).jpg |
Moro Rock is a large exfoliation dome in the Sierra Nevada Mountains of eastern California, USA. It is accessible by road and hiking trail in the western part of Sequoia National Park, a little east of Generals Highway (Rt. 198). Exfoliation domes are common in the Sierra Nevada Mountains. They form by large-scale spheroidal weathering of granites and granitoids of the Sierra Nevada Batholith. The batholith represents a Late Jurassic to Late Cretaceous-aged mass of cooled magma chambers originally beneath a chain of subduction zone stratovolcanoes. Pressure release from erosional unroofing of the batholith resulted in the rocks having curved sheeting joints. Spheroidal weathering followed, akin to peeling the layers from an onion (“exfoliation”). The end result is a rounded mountain top - an exfoliation dome. Moro Rock is the type locality of the Cretaceous-aged Giant Forest Granodiorite, one of numerous specific igneous intrusions in the Sierra Nevada Batholith. Granodiorite is dominated by quartz and sodic plagioclase feldspar and some potassium feldspar. The Giant Forest Pluton is also rich in hornblende amphibole (= black crystals) and relatively rich in small, ~honey-colored crystals of titanite (a.k.a. sphene - CaTiSiO5). Geologic unit & age: Giant Forest Granodiorite, Sequoia Intrusive Suite, late Albian Stage to early Cenomanian Stage, mid-Cretaceous, 97-102 Ma |
Date | |
Source | Moro Rock exfoliation dome (Giant Forest Granodiorite, mid-Cretaceous, 97-102 Ma; Sequoia National Park, California, USA) 1 |
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@N05/16179631303 (archive). It was reviewed on 1 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
1 December 2019
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current | 09:07, 1 December 2019 | 2,048 × 1,536 (1.17 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot S2 IS |
Exposure time | 1/1,000 sec (0.001) |
F-number | f/3.5 |
Date and time of data generation | 16:14, 10 July 2010 |
Lens focal length | 6 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 23:17, 12 March 2015 |
Y and C positioning | Centered |
Exif version | 2.2 |
Date and time of digitizing | 16:14, 10 July 2010 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 9.96875 |
APEX aperture | 3.625 |
APEX exposure bias | 0 |
Maximum land aperture | 2.875 APEX (f/2.71) |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 9,102.2222222222 |
Focal plane Y resolution | 9,142.8571428571 |
Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Portrait |
Supported Flashpix version | 1 |
Image width | 2,048 px |
Image height | 1,536 px |
Date metadata was last modified | 19:17, 12 March 2015 |