Tenuocharta cloudii type locality, Kingston Range (Cryogenian of the United States)

Where: San Bernardino County, California (35.8° N, 115.9° W: paleocoordinates 0.0° N, 0.0° E)

• coordinate stated in text

• small collection-level geographic resolution

When: KP1 Member (Kingston Peak Formation), Cryogenian (850.0 - 635.0 Ma)

• At the site bearing the fossils described in this paper, the contact appears to be interfingering with the fossils occurring in dolomite beds interbedded with mudstone. If this interpretation is correct, the fossils would occur in a dolomite bed at the top of the Beck Spring Dolomite and in a second dolomite bed about 15 m above the base of the Kingston Peak Formation. However, it is possible that both the fossil-bearing beds are in the lower Kingston Peak Formation and are separated by an unconformity from the Beck Spring Dolomite. Owing to incomplete exposure, this latter possibility cannot be eliminated.

Environment/lithology: shallow subtidal; oncoidal, cherty/siliceous dolomite and mudstone

• One meter east of the gully bottom is the following sequence, which is presented in stratigraphic order: 0.7 m of well exposed, massive dolomite: 3.4 m of intermittently exposed dolomite and mudstone along with covered intervals; 1.6 m of well exposed dolomite with chert in the lower one-half of the unit; and 0.8 m covered followed by more than 10 m of siltstone and mudstone. The fossils described in this paper are from the lower cherty interval in the 1.6 m thick dolomite unit. They also occur in chert and dolomite at this locality about 15 m higher in the section.

Size class: microfossils

Preservation: replaced with silica

Collected in 1987 ; reposited in the USNM

Collection methods: surface (float)

Primary reference: R. J. Horodyski and C. Mankiewicz. 1990. Possible Late Proterozoic skeletal algae from the Pahrump Group, Kingston Range, southeastern California. American Journal of Science 290-A:149-169 [J. Marcot/J. Marcot]more details

Purpose of describing collection: taphonomic analysis

PaleoDB collection 231847: authorized by Jonathan Marcot, entered by Jonathan Marcot on 20.09.2023

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Myxococcoides
  -
? Myxococcoides sp.
? Myxococcoides sp. Schopf 1968
"closely associated"
 Life -
Tenuocharta cloudii n. sp., ? Melanocyrillium sp.
Tenuocharta cloudii n. sp. Horodyski and Mankiewicz 1990
? Melanocyrillium sp. Bloeser 1985
"probably"