Locality 1, Swan Peak and Garden City Canyon, Zone "A-B" (Ordovician of the United States)

Where: Rich County, Utah (42.0° N, 111.5° W: paleocoordinates 7.5° S, 81.9° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Symphysurina bulbosa trilobite zone, Garden City Formation, Gasconadian (485.4 - 477.7 Ma)

• 16 foot interval starting at 37 feet above base of measured section. Zones A-B is Symphysurina bulbosa in modern usage.

• group of beds-level stratigraphic resolution

Environment/lithology: shallow subtidal; lithified, gray limestone and lithified, yellow, muddy limestone

• "Resistant, aphanitic, dark gray, laminar limestone in 2-4 foot beds, with thin interlayers of muddy, buff-weathered limestone and some thin lenses of intraformational conglomerate."

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 103786: authorized by Melanie Hopkins, entered by Melanie Hopkins on 02.02.2011

Creative Commons license: CC BY (attribution)

Taxonomic list

Trilobita
 Ptychopariida - Kingstoniidae
Clelandia utahensis Ross 1951 trilobite
 Asaphida - Nileidae
 Asaphida - Asaphidae
Bellefontia acuminiferentis Ross 1951 trilobite