ammonites
Locality 6, Hillyard's Canyon, Zone "F" (Ordovician of the United States)

Where: Franklin County, Idaho (42.1° N, 111.6° W: paleocoordinates 7.3° S, 82.1° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Rossaspis superciliosa trilobite zone, Garden City Formation, Stairsian (488.3 - 478.6 Ma)

• 306 feet above base of formation. Zone F.

Environment/lithology: shallow subtidal; lithology not reported

• Based on description of Garden City Formation from other sections in same reference.

Size classes: macrofossils, mesofossils

Preservation: replaced with silica

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

Collection methods: chemical,

Primary reference: R. J. Ross, Jr. 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/M. Hopkins] more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 103822: authorized by Melanie Hopkins, entered by Melanie Hopkins on 02.02.2011