San Angelo Formation

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San Angelo Formation
Stratigraphic range: Kungurian
TypeFormation
Unit ofPease River Group
UnderliesBlaine Formation
OverliesClear Fork Group
Location
RegionTexas
CountryUnited States

The San Angelo Formation is a geologic formation in Texas. It preserves fossils dating back to the Permian period. It is one of the geologically youngest formations to preserve fossils of pelycosaurs.

Stratigraphy and age[]

The San Angelo Formation belongs to the Kungurian stage of the Cisuralian series. It underlies the Blaine Formation, which is either upper Kungurian or lower Guadalupian.[1][2]

Fossil content[]

Everett C. Olson regarded the San Angelo Formation as preserving some of the oldest known therapsids, several of which he classified in a taxon he called Eotheriodonta.[3] These taxa are now interpreted as caseids and sphenacodontids, not therapsids.[4]

Color key
Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Synapsids[]

Genus Species Location Material Notes Images
Angelosaurus A. dolani A caseid
Caseoides C. sanangeloensis A caseid
Caseopsis C. agilis A caseid
Cotylorhynchus C. hancocki A caseid
Dimacrodon D. hottoni
Dimetrodon D. angelensis A sphenacodontid
Driveria D. ponderosa
Eosyodon E. hudsoni A dubious sphenacodontid[5]
Gorgodon G. minutus
Knoxosaurus K. niteckii
Mastersonia M. driverensis
Steppesaurus S. gurleyi
Tappenosaurus T. magnus

See also[]

References[]

  1. ^ DiMichele et al. 2001.
  2. ^ Lucas & Golubev 2019.
  3. ^ Olson 1962.
  4. ^ Sidor & Hopson 1995.
  5. ^ Kammerer 2011, p. 291.

Bibliography[]

  • DiMichele, William A.; Mamay, Sergius H.; Chaney, Dan S.; Hook, Robert W.; Nelson, W. John (2001). "An Early Permian flora with Late Permian and Mesozoic affinities from North-Central Texas". Journal of Paleontology. 75 (2): 12.
  • Kammerer, Christian F. (2011). "Systematics of the Anteosauria (Therapsida: Dinocephalia)". Journal of Systematic Palaeontology. 9 (2): 261–304. doi:10.1080/14772019.2010.492645. ISSN 1477-2019.
  • Lucas, Spencer G; Golubev, Valeriy K (2019). "Age and duration of Olson's Gap, a global hiatus in the Permian tetrapod fossil record". Permophiles: 5.
  • Olson, Everett C. (1962). "Late Permian Terrestrial Vertebrates, U. S. A. and U. S. S. R." Transactions of the American Philosophical Society. 52 (2): 1–224. doi:10.2307/1005904. ISSN 0065-9746. JSTOR 1005904.
  • Olson, Everett C.; Beerbower, James R. (1953). "The San Angelo Formation, Permian of Texas, and Its Vertebrates". The Journal of Geology. 61 (5): 389–423. doi:10.1086/626109. ISSN 0022-1376. JSTOR 30079693.
  • Sidor, C. A.; Hopson, J. A. (1995). "The taxonomic status of the Upper Permian eotheriodont therapsids of the San Angelo Formation (Guadalupian), Texas". Journal of Vertebrate Paleontology. 15 (3A): 53A.


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