Horeshoe Gulch, USGS BL31394-PC (Carboniferous of the United States)

Also known as Fisher and Henry collection

Where: Park County, Colorado (39.2° N, 106.2° W: paleocoordinates 0.3° S, 37.4° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Belden Shale Formation, Morrowan (318.1 - 314.6 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: offshore; lithified, gray, calcareous shale and lithified, fine-grained, shelly/skeletal, sandy wackestone

• Stratigraphy—Belden Shale (lower part); collected

•free-weathering and “crack-out” macrofossils from approximately

•8 to 10 ft of alternating, nodular, micritic limestone

•and shale. Lower limestone: skeletal carbonate

•mudstone, medium-dark-gray to dark-gray, weathering

•medium light gray to yellowish gray. Shale: medium-darkto

•dark-gray, slightly calcareous. Upper limestone (skeletal,

•brachiopodal, bryozoan wackestone to packstone):

•becoming more evenly bedded, slightly more skeletal,

•coarser grained, more sandy (containing quartz and feldspar

•grains), and thicker bedded upward, grading at top into

•fine-grained, pale-yellowish-brown-weathering, calcareous,

•skeletal, subarkosic sandstone; top beds make small

•ledges at ridge crest and on hillside.

Size class: macrofossils

Reposited in the USGS

Primary reference: T. W. Henry. 1998. The Brachiopod Antiquatonia coloradoensis (Girty) from the Upper Morrowan and Atokan (Lower Middle Pennsylvanian) of the United States. United States Geological Survey Professional Paper 1588:1-51 [J. Alroy/C. Simpson/C. Simpson]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 42822: authorized by John Alroy, entered by Carl Simpson on 05.08.2004, edited by Matthew Clapham

Creative Commons license: CC BY (attribution)

Taxonomic list

Trilobita
 Proetida - Proetidae
? Paladin sp. Weller 1936 trilobite
Strophomenata
 Productida -
Productida indet. Sarycheva and Sokolskaya 1959
gen. & sp. indet.
 Productida - Productellidae
 Productida - Productidae
 Productida - Linoproductidae
 Productida - Rugosochonetidae
Rhynchonellata
 Athyridida - Athyrididae
 Spiriferida - Trigonotretidae
"Spirifer goreii" = Neospirifer goreii
"Spirifer goreii" = Neospirifer goreii Mather 1915
 Spiriferida - Spiriferidae
Bivalvia
 Autobranchia -
Pterioida indet. Newell 1965 clam
Myalinid
Gastropoda
 Prosobranchia - Meekospiridae
Meekospira sp. Ulrich and Scofield 1897 snail
Cephalopoda
 Orthocerida -
Bryozoa
  -
Bryozoa indet. Ehrenberg 1831
Stenolaemata
 Fenestrata -
Fenestrata indet. Astrova and Morozova 1956
Fenestellid
 Rhabdomesida - Rhomboporidae
Rhombopora sp. Meek 1872
unclassified
  -
Pelmatozoa indet. Leuckart 1848
Columnals
Echinoidea
  - Archaeocidaridae
Archaeocidaris sp. M'Coy 1844 sea urchin
Crinoidea
  -
Crinoidea indet. Miller 1821 Sea lily
Plates
Anthozoa
 Rugosa -
Rugosa indet. horn coral
Lophophyllid