Where: British Columbia, Canada (49.7° N, 115.4° W: paleocoordinates 3.4° S, 77.7° W)

When: Wujiajiania sutherlandi trilobite zone, Unit H Formation (McKay Group), Steptoean (497.0 - 493.5 Ma)

• The Wujiajiania sutherlandi subzone is part of the Elvinia zone. That is about 497 Ma in Gradstein et al. (PJW3). Lower part of the formation.

•

•Figure 3 shows the assumed stratigraphy, with the W. sutherlandi fauna placed in the upper subzone of the Elvinia zone.

•

•“All known occurrences of dokimocephalid (s.s.) species are from the Upper Steptoean Elvinia Zone and correlatives. With the elevation of the basal Sunwaptan Irvingella major Subzone ( = upper Elvinia Zone of Palmer 1965) to a distinct zone (Chatterton & Ludvigsen 1998), the Elvinia Zone can be divided into two informal units: a lower division with Kindbladia (Frederickson, 1948), Plataspella (Wilson, 1949) and Bynumina (Resser, 1942) and an upper division that includes species of such genera as Camaraspis (Ulrich & Resser in Ulrich, 1924), Cliffia (Wilson, 1949) and Dellea (Wilson, 1949) (Westrop et al. 2007; see also Wilson 1949; Stitt 1977). Only two regions included in the study, Oklahoma and the Great Basin, have sufficient collections for a discussion of the biostratigraphy. In both regions, species of Dokimocephalidae s.s. occur throughout the Elvinia Zone, indicating that this clade was a genuine casualty of the extinction initiated at the base of the overlying Sunwaptan Stage (Irvingella major Zone).” Westrop et al. 2010.

• member-level stratigraphic resolution

Environment/lithology: offshore; lithified, gray, green phyllite and lithified sandstone

Size class: macrofossils

Preservation: concretion, permineralized, original calcite

Collection methods: University of Alberta and Royal British Columbia Museum houses much material

Primary reference: B.D.E. Chatterton and R. Ludvigsen. 1998. Upper Steptoean (Upper Cambrian) trilobites from the McKay Group of southeastern British Columbia, Canada. Journal of Paleontology 72(2):43 [S. Peters/S. Peters/S. Peters]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 54074: authorized by Shanan Peters, entered by Shanan Peters on 22.09.2005

Creative Commons license: CC BY (attribution)