Locality 8, Clarkston Mountains, Zone "H", lower (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, Garden City Formation, Blackhillsian (478.6 - 471.8 Ma)

• 208 foot interval beginning at 1135 feet above base of formation

Environment/lithology: shallow subtidal; lithified, shelly/skeletal limestone and lithified, intraclastic grainstone

• "Alternating 2- to 3-foot beds of intraformational conglomerate in a crystalline matrix, shelly crystalline limestone, and slabby, buff-weathered, muddy limestone."

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 103889: authorized by Melanie Hopkins, entered by Melanie Hopkins on 03.02.2011

Creative Commons license: CC BY (attribution)

Taxonomic list

Trilobita
 Asaphida - Asaphidae
Trigonocerca typica Ross 1951 trilobite
 Phacopida - Pliomeridae
Protopliomerops sp. Kobayashi 1934 trilobite