YPM 20101 - 20110 (Yale Peabody Museum) (Carboniferous to of the United States)

Also known as Sando et al. Wiggins Fork Loc.48

Where: Fremont County, Wyoming (43.6° N, 109.5° W: paleocoordinates 1.9° N, 39.2° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Anthracospirifer welleri - shawi zone, Horseshoe Member (Amsden Formation), Chesterian to Chesterian (335.5 - 321.8 Ma)

• Dolomite 39 - 43 ft above top of Darwin Member. "Carlinia amsdeniana Subzone. Late Mississippian (Chesterian)."

• bed-level stratigraphic resolution

Environment/lithology: offshore; lithified, red, silty, sandy, calcareous shale and gypsiferous, shelly/skeletal limestone

• horseshoe: predominantly fissile, platy or blocky siltstone, shale, and mudstone. weathers bright red to grayish red or purple. thin beds and lenses of platy, white to red, fine grained, commonly calcareous quartz sandstone occur sporadically throughout member. thin beds of silty, sandy, or argillaceous limestone are rare in central wy, significant proportion in western wy. dolomite is a rare constituent. limestone beds are either fine grained and unfossiliferous or fine to medium grained and contain a shelly fauna. anhydrite and gypsum present at several localities. represents offshore marine facies of the transgressing amsden sea.

Reposited in the YPM

• "Collected by J.D. Love, 1937? Fossils listed by Love, 1939, p.28, Burk, 1954, p.4, Shaw, 1955, p.62, fig.1, and Keefer and Van Lieu, 1966, table 6."

Primary reference: W. J. Sando, M., J.r. Gordon, and J. T. Dutro. 1975. Stratigraphy and geologic history of the Amsden Formation (Mississippian and Pennsylvanian) of Wyoming. United States Geological Survey Professional Paper 848A:1-83 [J. Alroy/M. Sommers/P. Wagner]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 5723: authorized by John Alroy, entered by Mike Sommers on 17.11.1999

Creative Commons license: CC BY (attribution)

Taxonomic list

Gastropoda
 Bellerophontida - Bellerophontidae
"? Knightites (Retispira) sp." = Retispira
"? Knightites (Retispira) sp." = Retispira Knight 1945 snail
sgn. (Retispira)
 Murchisoniina - Soleniscidae
Ianthinopsis spp. Meek and Worthen 1866 snail
 Neritoidea - Naticopsidae
? Naticopsis (Naticopsis) sp. M'Coy 1844 snail
sgn. (Naticopsis)
Strophomenata
 Productida - Productidae
 Productida - Productellidae
Rhynchonellata
 Athyridida - Athyrididae
Composita sigma Gordon 1975
 Spiriferida - Spiriferidae
Anthracospirifer shawi Gordon 1975
ssp. shawi
Anthracospirifer ? shawi Gordon 1975
ssp. exoletus
Anthozoa
 Stauriida - Hapsiphyllidae
? Zaphrentites sp. Hudson 1941 horn coral