Where: Utah (39.2° N, 113.4° W: paleocoordinates 4.2° S, 91.6° W)

• coordinate based on nearby landmark

When: Ptychagnostus punctuosus trilobite zone, Marjum Limestone Formation, Marjumian (504.5 - 497.0 Ma)

• PJW: Jack gave "Bolaspidella zone," but authors give Ptychagnostus punctuosus. “185 to 200 m above the base of the Marjum Formation.”

• group of beds-level stratigraphic resolution

Environment/lithology: marine; limestone and shale

Size classes: macrofossils, mesofossils

Collection methods: In 1982, R. A. Robison and Val Gunther discovered a fragmentary homoiostelean echinoderm in the Marjum Formation of the House Range, Utah. Further search of the locality resulted in a collection of almost 100 additional specimens, mostly from talus but a few from outcropping beds. Subsequent careful excavation, mainly by Lloyd, Metta, and Val Gunther, produced numerous well-preserved echinoderms and arthropods as well as rare specimens of other taxa.

Primary reference: G. Ubaghs and R. A. Robison. 1985. A new homoiostelean and a new eocrinoid from the Middle Cambrian of Utah. The University of Kansas Paleontological Contributions 115:1-24 [P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 261: authorized by Jack Sepkoski, entered by Mike Sommers on 20.11.1998, edited by Pete Wagner and Phil Novack-Gottshall

Creative Commons license: CC BY (attribution)