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Fasciculus:Glen Canyon Park Chert Outcrop.jpg

Sua resolutio ‎(2 504 × 2 008 elementa imaginalia, magnitudo fasciculi: 2.17 megaocteti, typus MIME: image/jpeg)

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Summarium

Descriptio
English: Roadcut revealing Franciscan chert rock, Glen Canyon Park, San Francisco, California.[1] 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.[2] 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. This roadcut presumably dates from that time.[3]
Datum
Fons Opus proprium
Auctor Eric A. Schiff
Camera location37° 44′ 19.18″ N, 122° 26′ 33.07″ W  Heading=270° Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo

References

  1. ↑ Wahrhaftig, Clyde (1984) A streetcar to subduction and other plate tectonic trips by public transport in San Francisco, American Geophysical Union, pp. 29−32 ISBN: 9780875902340. See figures 24 and 25 in particular.
  2. ↑ Sloan, Doris (2006). Geology of the San Francisco Bay Region (University of California Press). ISBN 978-0520241268.
  3. ↑ 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.

Potestas usoris

w:en:Creative Commons
attributio aequa parte
This file is licensed under the Creative Commons Attribution-Share Alike 2.5 Generic license.
Attributio: Eric A. Schiff
Tibi licet:
  • communicare – copiare, distribuere et committere hoc opus
  • to remix – to adapt the work
His condicionibus:
  • attributio – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
  • aequa parte – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.

Captions

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Outcrop of Franciscan radiolarian chert in San Francisco, California

Items portrayed in this file

depicts Anglica

radiolarite Anglica

chert Anglica

copyright status Anglica

copyrighted Anglica

inceptio

15 Aprilis 2007

coordinates of the point of view Anglica

37°44'19.18"N, 122°26'33.07"W

heading Anglica: 270 gradus anguli

Historia fasciculi

Presso die vel tempore fasciculum videbis, sicut tunc temporis apparuit.

Dies/TempusMinutioDimensionesUsorSententia
recentissima04:05, 16 Aprilis 2007Minutum speculum redactionis 04:05, 16 Aprilis 2007 factae2 504 × 2 008 (2.17 megaocteti)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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