Ptychagnostus atavus or Leiopyge calva Zone (Cambrian of the United States)

Where: Utah (38.9° N, 113.4° W: paleocoordinates 4.2° S, 92.0° W)

• coordinate based on political unit

• basin-level geographic resolution

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

• "Ptyagnostus atavus or Leiopyge calva Zone" (Topazan, which is still Marjumian here; PJW)

Environment/lithology: offshore ramp; burrowed, peloidal packstone

• "carbonate packstone, w/ f-p congl., 30-50 cm thick, bioturbation, peloidal mud. subtidal, open shelf, upper slopes of a ramp, BA2 or possibly 4

Size classes: macrofossils, mesofossils

Primary reference: A. J. Rowell and N. E. Caruso. 1985. The evolutionary significance of Nisusia sulcata, an early articulate brachiopod. Journal of Paleontology 59(5):1227-1242 [A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 262: authorized by Jack Sepkoski, entered by Mike Sommers on 20.11.1998

Creative Commons license: CC BY (attribution)

Taxonomic list

• "A.J. Rowell and N.E.Caruso, 1985. The evolutionary significance of Nisusia sulcata an early articulate brachiopod. J.Paleo 59:1227-1242."
 Corynexochida - Dorypygidae
Olenoides sp. Meek 1877 trilobite
 Ptychopariida - Marjumiidae
Modocia sp. Walcott 1924 trilobite
 Agnostida - Peronopsidae
Peronopsis sp. Corda 1847
 Kutorginida - Nisusiidae
Nisusia sp. Walcott 1905
 Acrotretida - Acrotretidae
Prototreta sp. Bell 1941