Locality 13, Round Hill, Zone "J" (Ordovician of the United States)

Where: Box Elder County, Utah (41.5° N, 111.9° W: paleocoordinates 7.9° S, 80.1° W)

• coordinate estimated from map

• local area-level geographic resolution

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

• 85 foot interval beginning at base of formation

• group of beds-level stratigraphic resolution

Environment/lithology: shallow subtidal; lithified, fine-grained limestone and lithified, nodular, black chert

• "Resistant, irregularly laminated, aphanitic limestone with black chert stringers and nodules roughly paralleling laminae, comprising 20% of rock near bottom."

Size class: macrofossils

Collected by R. J. Ross, Jr. in 1946-1947; reposited in the YPM

Primary reference: R. J., J.r. Ross. 1951. Stratigraphy of the Garden City Formation in northeastern Utah, and its trilobite faunas. Yale Peabody Museum of Natural History Bulletin 6:1-161 [S. Finnegan/S. Finnegan/P. Wagner]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 103917: authorized by Melanie Hopkins, entered by Melanie Hopkins on 03.02.2011

Creative Commons license: CC BY (attribution)

Taxonomic list

• Description in measured section states that this interval contained a "complete trilobite assemblage from Zone 'J'" (p. 23). Taxonomic list taken from faunal list on p. 27-28.
Show authors, comments, and common names
Rhynchonellata
 Orthida - Finkelnburgiidae
Diparelasma sp.
Diparelasma sp. Ulrich and Cooper 1936
 Orthida - Hesperonomiidae
Hesperonomia sp.
Hesperonomia sp. Ulrich and Cooper 1936
Trilobita
 Asaphida - Asaphidae
Lachnostoma latucelsum n. sp., Kirkella declevita n. sp., ? Isoteloides sp.
Lachnostoma latucelsum n. sp. Ross 1951 trilobite
Kirkella declevita n. sp. Ross 1951 trilobite
? Isoteloides sp. Raymond 1910 trilobite
 Phacopida - Cheiruridae
"Kawina sexapugia n. sp." = Forteyops sexapugia
"Kawina sexapugia n. sp." = Forteyops sexapugia Ross 1951 trilobite
 Phacopida - Pliomeridae
Pseudocybele nasuta
Pseudocybele nasuta Ross 1951 trilobite
 Proetida - Bathyuridae
"Eleutherocentrus williamsi n. sp." = Acidiphorus williamsi
"Eleutherocentrus williamsi n. sp." = Acidiphorus williamsi Ross 1951 trilobite
 Proetida - Dimeropygidae
Dimeropygiella caudanodosa n. sp.
Dimeropygiella caudanodosa n. sp. Ross 1951 trilobite
 Proetida - Telephinidae
Carolinites genacinaca
Carolinites genacinaca Ross 1951 trilobite
Chlorophyceae
  - Receptaculitidae
Receptaculites sp.
Receptaculites sp. Defrance 1827