USGS 21676-PC (Carboniferous of the United States)

Also known as Sando et al. Bull Lake Creek Loc.40

Where: Fremont County, Wyoming (43.2° N, 109.2° W: paleocoordinates 4.2° N, 36.4° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Ranchester Member (Amsden Formation), Morrowan (323.2 - 318.6 Ma)

• Dolomite 40 ft above top of Darwin Member. Pennsylvanian (Morrowan).

• group of beds-level stratigraphic resolution

Environment/lithology: offshore shelf; lithified, lenticular, concretionary, gray, yellow, sandy, cherty/siliceous dolomite and green, red shale

• ranchester: heterogenous sequence of interbedded chery dolomite and limestone, sandstone, and shale. carbonate rocks predominate; thin- to thick-bedded, fine grained to coarsely crystalling, yellowish-gray weathering dolomite and dolomitic limestone are generally much more abundant than thin-bedded, fine- to medium-grained, light-gray to purple weathering limestone. carbonate beds, particularly dolomites, contain abundant gray, brown or jasperoid chert in small nodules, irregular lenses and irregular networks. red and green shale in thin beds and partings are commonly interbedded with the carbonate rocks, particularly in the upper half, and may compose significant thicknesses of the member at some localities. thin beds of fine- to medium-grained, white to pink sandstone occur throughout the member but are most abundant in the upper half. quartz sand is also a minor constituent of some of the carbonate beds. anhydrite was reported as a minor constituent of some dolomite beds.

Reposited in the USGS

• "Collected by W.J. Sando and K.R. Moore, 1964."

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 5713: authorized by John Alroy, entered by Mike Sommers on 17.11.1999

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Cephalopoda
 Goniatitida -
"Goniatitacea indet." = Goniatitoidea
"Goniatitacea indet." = Goniatitoidea Haan 1825 ammonite
goniatitacean gen. et sp. indet.
Gastropoda
 Bellerophontida - Bellerophontidae
"Knightites (Retispira) sp." = Retispira
"Knightites (Retispira) sp." = Retispira Knight 1945 snail
sgn. (Retispira) sp. B
 Murchisoniina - Gosseletinidae
? Baylea sp.
? Baylea sp. de Koninck 1881 snail
 Murchisoniina - Phymatopleuridae
Borestus sp.
Borestus sp. Thomas 1940 snail
 Euomphalina - Microdomatidae
? Microdoma sp.
? Microdoma sp. Meek and Worthen 1867 snail
 Euomphalina - Elasmonematidae
Anematina sp.
Anematina sp. Knight 1933 snail
 Neritoidea - Naticopsidae
Colpites sp.
Colpites sp. Knight 1936 snail
sp. A
 Caenogastropoda - Orthonematidae
Orthonema sp.
Orthonema sp. Meek and Worthen 1862 snail
 Zygopleuroidea - Pseudozygopleuridae
"Palaeostylus (Pseudozygopleura) spp." = Pseudozygopleura
"Palaeostylus (Pseudozygopleura) spp." = Pseudozygopleura Knight 1930 snail
sgn. (Pseudozygopleura)
Bivalvia
 Pholadomyida - Edmondiidae
Edmondia spp.
Edmondia spp. de Koninck 1841 clam
 Carditida - Astartidae
Astartella concentrica
Astartella concentrica Conrad 1842 clam
 Trigoniida - Schizodidae
Schizodus aff. affinis
Schizodus aff. affinis Herrick 1887 clam