Al Rose Formation

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Al Rose Formation
Stratigraphic range: Ordovician
Type Formation
Unit of Mazourka Group [1]
Underlies Badger Flat Limestone [1]
Lithology
Primary siltstone, mudstone, and shale [2]
Other chert [2]
Location
Region Talc City Hills, California [3]
Country United States
Type section
Named forAl Rose Canyon, Inyo County, California [1]
Named by Donald Clarence Ross [1]

The Al Rose Formation is a geologic formation located in Inyo County, California. It is notable for preserving fossils from the Cambrian Period, offering insights into early Paleozoic life and environments. [4]

Contents

Stratigraphy

The formation is primarily composed of shale, with interbedded limestone and sandstone layers, indicating a range of depositional environments. These rocks were deposited in a marine setting, as evidenced by their fossil content and sedimentary structures. [5] The formation is stratigraphically positioned within the Great Basin region, an area renowned for its well-preserved Cambrian stratigraphy. [6]

Fossil Content

Fossils recovered from the formation include a variety of trilobites, brachiopods, and archaeocyathids, providing critical data on the diversity of life during the Cambrian explosion. [7] These fossils help paleontologists reconstruct ancient ecosystems and understand evolutionary dynamics during the Cambrian.

Regional Significance

The formation is a key part of the Cambrian stratigraphy in California. Its correlation with other Cambrian formations in the Great Basin, such as the Carrara Formation and the Bonanza King Formation, aids geologists in understanding the geological history of the region and broader paleoenvironmental changes. [8]

See also

References

  1. 1 2 3 4 Donald C. Ross (1963). "New Cambrian, Ordovician, and Silurian Formations in the Independence quadrangle, Inyo County, California" (PDF). Geological Survey Professional Paper. 475B: B74 –B85. ISSN   0096-0446. Wikidata   Q66311354.
  2. 1 2 Donald Clarence Ross (1966). "Stratigraphy of some Paleozoic formations in the Independence quadrangle, Inyo County, California" (PDF). Geological Survey Professional Paper. 396. doi:10.3133/PP396. ISSN   0096-0446. Wikidata   Q61048695.
  3. ↑ Paul Stone; G.C. Dunne; C.H. Stevens; R.M. Gulliver (1989), Geologic map of Paleozoic and Mesozoic rocks in parts of the Darwin and adjacent quadrangles, Inyo County, California, doi:10.3133/I1932, Wikidata   Q57855860
  4. ↑ Barnes, H., & Palmer, A. R. (1961). Cambrian stratigraphy and trilobites of the Al Rose Formation, California. Geological Society of America Bulletin, 72(2), 157-175. https://doi.org/10.1130/0016-7606(1961)72[157:CSAOTR]2.0.CO;2
  5. ↑ Levi, S. T., & Garfunkel, Z. (1988). Depositional environments and tectonic settings of Cambrian formations in the Great Basin region. Journal of Sedimentary Research, 58(3), 502-519. https://doi.org/10.1306/212F8E52-2B24-11D7-8648000102C1865D
  6. ↑ USGS. (2023). Cambrian formations of California: Geological summaries. United States Geological Survey Database. Retrieved from https://www.usgs.gov
  7. ↑ Moore, J. D. (1995). Fossil assemblages of the Cambrian in California. In K. C. Spencer (Ed.), Paleozoic Geology of the Western United States (pp. 213-234). Cambridge University Press.
  8. ↑ Barnes, H., & Palmer, A. R. (1961). Cambrian stratigraphy and trilobites of the Al Rose Formation, California. Geological Society of America Bulletin, 72(2), 157-175. https://doi.org/10.1130/0016-7606(1961)72[157:CSAOTR]2.0.CO;2
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