Punchbowl Formation

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Coordinates: 34°00′N 118°12′W / 34.0°N 118.2°W / 34.0; -118.2
Source: Wikipedia, the free encyclopedia.
Punchbowl Formation
Ma
Devil's Punchbowl
Named byNoble
Year defined1953
Punchbowl Formation is located in the United States
Punchbowl Formation
Punchbowl Formation (the United States)
Punchbowl Formation is located in California
Punchbowl Formation

The Punchbowl Formation is a sedimentary

Los Angeles County, southern California.[2][3]

Geology

The sandstone beds of the formation are exposed in the walls of the

gorge within the Devil's Punchbowl Natural Area, an L.A. County park within the Angeles National Forest. Three separate faults have folded and uplifted the formation in view.[2] The Devil's Punchbowl is a large plunging sandstone syncline, where the edges of the formation have been folded upward, and the center has dipped. It was formed by the Punchbowl Fault, which is near the San Andreas Fault
to the north.

The Punchbowl Formation crops out in the Punchbowl Block and comprises approximately 1,500 metres (4,900 ft) of

alluvial conglomerates, sandstones, and minor mudstones, which accumulated during the middle-late Miocene. A distinct basal member is middle Miocene in age. The underlying Paradise Springs and Vasquez Formations were formerly interpreted as either part of the basal Punchbowl Formation, or deposits in a fault-bounded sliver along the Punchbowl Fault that originated in a separate basin.[4]

The Devil's Punchbowl drainage flows into Sandrock Creek, a tributary of Big Rock Creek, which disappears into the Mojave Desert.[2]

Fossil content

The uplifted formation preserves

Ages (~5-10 million years ago).[2][5]

Mammals

Artiodactyls

Perissodactyls

Carnivora

Rodents

Reptiles

Turtles

Gallery

See also

References

  1. Wikidata Q57842316
    .
  2. ^ a b c d UCB−Seismo.berkeley.edu: Field Guide to the Punchbowl Fault Zone at the Devil's Punchbowl Natural Area Archived 2016-03-05 at the Wayback Machine . accessed 7.7.2015
  3. ^ a b Punchbowl Formation at Fossilworks.org
  4. ^ Coffey et al., 2019, p.480
  5. ^ L.A. County: "Geological History", with images
  6. ^ a b c d Pagnac, 2006
  7. ^ Liter & Prothero, 2003
  8. ^ a b c d e f g h i j k l m n o p q r s Woodburne & Golz, 1972
  9. ^ a b c Wagner & Reynolds, 1983
  10. ^ Woodburne, 2005

Bibliography

  • Coffey, Kevin T.; Raymond V. Ingersoll, and Axel K. Schmitt. 2019. Stratigraphy, provenance, and tectonic significance of the Punchbowl block, San Gabriel Mountains, California, USA. Geosphere 15. 479–501. .
  • Pagnac, D. 2006. Scaphohippus, a new genus of horse (Mammalia: Equidae) from the Barstow Formation of California. Journal of Mammalian Evolution 13. 37–61. .
  • Woodburne, M. O. 2005. A new occurrence of Cormohipparion, with implications for the Old World Hippotherium Datum. Journal of Vertebrate Paleontology 25. 256–257. .
  • Liter, M., and D. Prothero. 2003. New dromomerycids (Mammalia: Artiodactyla) from the middle Miocene Sharktooth Hill Bonebed, California, and the systematics of the cranioceratinins. Journal of Vertebrate Paleontology 23. 72A. .
  • Wagner, H. M., and R. E. Reynolds. 1983. Leptarctus ancipidens (White) (Carnivora: Mammalia) from the Punchbowl Formation, Cajon Pass, California.
    Bulletin of the Southern California Academy of Sciences
     82. 131–137. .
  • Woodburne, M. O., and D. J. Golz. 1972. Stratigraphy of the Punchbowl Formation, Cajon Valley, southern California. University of California Publications in Geological Sciences 92. 1–72. .

External links

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