Ellipsocephaloides silvestris Subzone assemblage (Cambrian of Canada)

Where: Alberta, Canada (51.5° N, 116.2° W: paleocoordinates 2.8° S, 75.6° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Bison Creek Formation, Sunwaptan (498.5 - 485.4 Ma)

• approximately 80m above the base of the Bison Creek Formation; most fossiliferous in unit

• group of beds-level stratigraphic resolution

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

• at type section Bison Creek consists of 177m of calcareous shales and mudstones, calcarenites, intrarudites, and algal buildups

Size class: macrofossils

Primary reference: S. R. Westrop. 1986. Trilobites of the Upper Cambrian Sunwaptan Stage, southern Canadian Rocky Mountains, Alberta. Palaeontographica Canadiana 3:1-179 [S. Peters/S. Peters/U. Merkel]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 54091: authorized by Shanan Peters, entered by Shanan Peters on 22.09.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

Trilobita
 Ptychopariida - Kingstoniidae
 Ptychopariida - Catillicephalidae
? Triarthropsis sp. Ulrich 1931 trilobite
 Ptychopariida - Elviniidae
Chariocephalus whitfieldi Hall 1863 trilobite
 Asaphida - Dikelocephalidae
Prosaukia misa Owen 1852 trilobite
 Asaphida - Ptychaspididae
Keithiella cf. depressa Rasetti 1944 trilobite
Ptychaspis sp. Hall 1863 trilobite
Idiomesus granti trilobite
 Olenida - Idahoiidae
Wilbernia pero Walcott 1890 trilobite
 Olenida - Parabolinoididae
Croixana inflata trilobite
? Minkella sp. Lochmann and Hu 1959 trilobite
  - Ellipsocephaloididae
Artiopoda
 Agnostida - Diplagnostidae
"Pseudagnostus josepha" = Pseudagnostus josephus
"Pseudagnostus josepha" = Pseudagnostus josephus Hall 1863