"Upper Cherty Member" Garden City Fm., Zone J, upper Arenig (Ordovician of the United States)

Where: Utah (40.2° N, 110.4° W: paleocoordinates 9.3° S, 81.1° W)

• coordinate based on political unit

• basin-level geographic resolution

When: Pseudocybele nasuta trilobite zone, Garden City Formation, Blackhillsian (474.9 - 470.0 Ma)

• "upper Arenig". PJW: Zone J (Pseudocybele nasuta) is Blackhillsian.

• member-level stratigraphic resolution

Environment/lithology: slope; black, cherty/siliceous limestone and shale

• "black sh, cherty ls (dark irregularly laminated). slope? or outer shelf. BA5. geosynclinal"

Size class: macrofossils

Primary reference: R. J., J.r. Ross. 1949. Stratigraphy and trilobite faunal zones of the Garden City Formation, northeastern Utah. American Journal of Science 247(7):472-491 [M. Uhen/J. Ju/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 295: authorized by Jack Sepkoski, entered by Mike Sommers on 21.03.1999

Creative Commons license: CC BY (attribution)

Taxonomic list

• "R.J.Ross Jr. (1949,1951,1968)" [stratigraphy, trilobites, brachiopods]
Show authors, comments, and common names
Radiocyatha
  - Soanitidae
Calathium sp.
Calathium sp. Billings 1865
Strophomenata
 Billingsellida - Polytoechiidae
Tritoechia sp.
Tritoechia sp. Ulrich and Cooper 1936
Rhynchonellata
 Pentamerida - Tetralobulidae
Syntrophopsis polita
 Orthida - Hesperonomiidae
Hesperonomia dinorthoides
 Orthida - Finkelnburgiidae
Diparelasma sp.
Diparelasma sp. Ulrich and Cooper 1936
Trilobita
 Asaphida - Asaphidae
Isoteloides sp., Lachnostoma sp., "Ptychocephalus sp." = Ptyocephalus
Isoteloides sp. Raymond 1910 trilobite
Lachnostoma sp. Ross 1951 trilobite
"Ptychocephalus sp." = Ptyocephalus Agassiz 1843 trilobite
originally entered as "Ptyocephalus sp."
 Proetida - Dimeropygidae
Dimeropygiella sp.
Dimeropygiella sp. Ross 1951 trilobite
 Proetida - Telephinidae
Carolinites sp.
Carolinites sp. Kobayashi 1940 trilobite
 Proetida - Bathyuridae
Eleutherocentrus sp.
Eleutherocentrus sp. Clark 1935 trilobite
 Phacopida - Cheiruridae
Kawina sp.
Kawina sp. Barton 1916 trilobite
 Phacopida - Pliomeridae
Pseudocybele sp.
Pseudocybele sp. Ross 1951 trilobite