Placerville Localities 5 + 6 (Permian of the United States)

Also known as San Miguel Canyon

Where: San Miguel County, Colorado (38.0° N, 108.0° W: paleocoordinates 8.7° N, 32.9° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Cutler Formation, Wolfcamp (296.4 - 268.0 Ma)

• about 860-885 feet below top of Cutler Fm.

•" [...] the present [...] study [...] has convinced us that the age is Early Permian beyond all reasonable doubt, equivalent to that of the Moran, Putnam, and Admiral Formations of Texas." (Lewis & Vaughn, 1965 p. C41). According to that statement the collection is of Wolfcampian age.

• group of beds-level stratigraphic resolution

Environment/lithology: fluvial-lacustrine; fine, micaceous, red siliciclastic sediments and lenticular, gray conglomerate

• No interpretation is given by the authors. The description of the rocks suggests that they represent a playa setting with periodically active alluvial fans.
• "In the Placerville area, the Cutler Formation is made up of interbedded, interlensing conglomerate, sandstone, siltstone, and shale. [...] The coarse clastic rock outcrops are generally a dark red to maroon, but they are gray to

•greenish gray in some places. [...] Crossbedding is common. Torrential deposition took place, as shown by lateral gradation, interlensing, and interbed

•ding between sandstone and conglomerate. No individual beds of conglomerate can be traced laterally for more than a few hundred feet. Finer grained micaceous sandstone, siltstone, and shale that weather to hematite red commonly contain bleached zones from 1 to 75 mm in diameter; these zones seemingly have organic centers. These finer clastics yielded almost all the fossil vertebrates; they contain many mud cracks and raindrop and other impressions including footprints." (Lewis & Vaughn, 1965 p. C5)

Size class: macrofossils

Reposited in the MCZ, USNM

Collection methods: bulk,

Primary reference: G. E. Lewis and P. P. Vaughn. 1965. Early Permian Vertebrates from the Cutler Formation of the Placerville Area, Colorado. United States Geological Survey Professional Papers 503-C:C1-C46 [J. Mueller/T. Liebrecht/T. Liebrecht]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 85478: authorized by Johannes Mueller, entered by Torsten Liebrecht on 29.12.2008

Creative Commons license: CC BY (attribution)

Taxonomic list

Osteichthyes
 Temnospondyli - Eryopidae
Eryops cf. grandis Marsh 1878 tetrapod
MCZ 2980
 Caseasauria - Eothyrididae
"Mycterosaurus smithae" = Vaughnictis smithae
"Mycterosaurus smithae" = Vaughnictis smithae Lewis and Vaughn 1965 synapsid
USNM 22098