Where: Inyo County, California (36.8° N, 117.5° W: paleocoordinates 3.0° N, 46.9° W)
• coordinate estimated from map
When: Rest Spring Formation, Arnsbergian (327.0 - 323.7 Ma)
• McAllister (1952) and Gordon (1964) say this is the uppermost 10 ft and probably lower 5 ft of Rest Spring Shale
•If Perdido group, this would be the Mexican Spring Formation of Stevens et al., 1996
•Titus (2000) says this is lower Rest Spring Shale, but doesn't give any evidence. Says "the formational contact between the Rest Spring Shale and the underlying Mexican Spring Formation essentially coincides with the Pendleian-Arnsbergian boundary" making this Arnsbergian if Rest Spring, or Pendleian if Mexican Spring.
Environment/lithology: marine; fine-grained, gray limestone and calcareous siltstone
Size class: macrofossils
Collected by R. F. Johnson in Aug. 16, 1949; reposited in the USNM
Primary reference: M. Gordon, Jr. 1964. California Carboniferous cephalopods. United States Geological Survey Professional Paper 483-A:A1-A27 [J. Marcot/J. Marcot/J. Marcot]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 217081: authorized by Jonathan Marcot, entered by Jonathan Marcot on 22.01.2021
Creative Commons license: CC BY (attribution)
Taxonomic list
Cephalopoda | |
Mitorthoceras cf. perfilosum Gordon 1960 | |
Rayonnoceras aff. solidiforme Croneis 1926 | |
Eosyngastrioceras quadratum n. sp.
Eosyngastrioceras quadratum n. sp. Titus 2000 ammonite | |
Delepinoceras californicum n. sp.
Delepinoceras californicum n. sp. Gordon 1964 ammonite |