Image:Glen Canyon Park Chert Outcrop.jpg

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[edit] Summary

Description

Roadcut revealing Franciscan chert rock, Glen Canyon Park, San Francisco, California. This type of chert contains the skeletons of innumerable radiolarian creatures. It is a sedimentary rock, and the visible layering is due to the occasional inclusion of shale layers as the rock was deposited over millions of years.[1] The shale weathers more rapidly than the predominant chert, so the weathered rock looks like a stack. The remarkable folding of the stacked layers indicates the tectonic forces on this rock in this past, which warped the original planar layers into the fantastic shapes they now present. The road in the foreground is O'Shaughnessy Boulevard, which was constructed around 1935.[2]

Source

self-made

Date

April 15, 2007

Author

Eric A. Schiff

Permission
(Reusing this image)

see below


[edit] References

  1. Sloan, Doris (2006). Geology of the San Francisco Bay Region (University of California Press). ISBN 978-0520241268.
  2. San Francisco Recreation and Parks Department, "Significant Natural Resources Areas Management Plan," section 6.3 "Glen Canyon Park and O’Shaughnessy Hollow," (Final Draft Plan, February, 2006). This section contains several detailed maps on "Soils, Land Features, and Trails," "Vegetation," and "Sensitive Species and Bird Habitat." Retrieved February 3, 2007.

[edit] Licensing

Creative Commons License
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This file is licensed under the Creative Commons Attribution ShareAlike 2.5 License. In short: you are free to share and make derivative works of the file under the conditions that you appropriately attribute it, and that you distribute it only under a license identical to this one. Official license


Attribution: Eric A. Schiff

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Date et heureDimensionsUtilisateurCommentaire
actuel16 avril 2007 à 06:052 504×2 008 (2,17 Mio)Easchiff ({{Information |Description=Outcrop of Franciscan chert rock, Glen Canyon Park, San Francisco, California. |Source=self-made |Date=April 15, 2007 |Author= Eric A. Schiff |other_versions= }})

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