Locality 8, Clarkston Mountains, Zone "H", upper (Ordovician of the United States)

Where: Box Elder County, Utah (41.9° N, 112.1° W: paleocoordinates 7.6° S, 79.7° W)

• coordinate estimated from map

• outcrop-level geographic resolution

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

• 135 foot interval beginning at 1343 feet above base of formation. Zone H.

Environment/lithology: shallow subtidal; lithified limestone and lithified, black chert

• "Resistant thinly laminated, finely crystalline limestone with black chert content diminishing downward. Irregular laminae separated by paper-thin mud partings."

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 103888: authorized by Melanie Hopkins, entered by Melanie Hopkins on 03.02.2011, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Pterobranchia
 Graptoloidea - Pterograptidae
"Didymograptus cf. nitidus" = Didymograptellus nitidus
"Didymograptus cf. nitidus" = Didymograptellus nitidus Hall 1858 graptolite
 Graptoloidea - Anisograptidae
"Dictyonema cf. flabelliforme" = Rhabdinopora flabelliformis, "Rhabdinopora anglica" = Rhabdinopora flabelliformis anglica
"Dictyonema cf. flabelliforme" = Rhabdinopora flabelliformis Eichwald 1840 graptolite
D. cf. flabelliforme anglicum also listed
"Rhabdinopora anglica" = Rhabdinopora flabelliformis anglica Bulman 1927 graptolite
Trilobita
 Asaphida - Asaphidae
Trigonocerca typica
Trigonocerca typica Ross 1951 trilobite