Section A1, West of the Fossil Gully Fault (Cambrian of Canada)

Where: Brithish Columbia, Canada (51.4° N, 116.4° W: paleocoordinates 3.4° S, 79.5° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Plagiura–Kochaspis trilobite zone, Mount Whyte Formation, Middle Cambrian (513.0 - 501.0 Ma)

• Stage 5

• formation-level stratigraphic resolution

Environment/lithology: basinal (); lithified, muddy packstone

• The oldest beds exposed in the strip are the middle thin interbeds of the shaly mudstone and limestone (MWC on Fig. 3) of the Mount Whyte Formation being the lateral extensions of beds 3 and 4 in Rasetti’s Monarch Mine section No. 17. They are covered mostly by talus and underlie the 30 m-thick, well-bedded limestone unit (W on

•Fig. 2.3; MWL on Fig. 3) forming the steeply downslopedipping cliff just northeast of Gully 5. Most of the beds in this top limestone are recrystallized packstones and

•grainstones replete with fragmental trilobites, brachiopods, and well-preserved molluscs.

Size class: macrofossils

Collection methods: bulk,

Primary reference: T. P. Fletcher and D. H. Collins. 2003. The Burgess Shale and associated Cambrian formations west of the Fossil Gully Fault Zone on Mount Stephen, British Columbia. Canadian Journal of Earth Sciences 40(12):1823-1838 [L. Na/L. Na/L. Na]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 188658: authorized by Lin Na, entered by Lin Na on 11.09.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

 Corynexochida - Zacanthoididae
Fieldaspis furcata trilobite
Rasetti 1951
Fieldaspis celer Walcott 1917 trilobite
Walcott 1917
Fieldaspis bilobata Rasetti 1951 trilobite
Walcott 1917
Loxopeltis problematica Rasetti 1957 trilobite
Rasetti, 1957
  - Antagmidae
Onchocephalus maior trilobite
Rasetti 1951
 Ptychopariida -
Caborcella rara Rasetti 1951 trilobite
Rasetti 1951
 Ptychopariida - Ptychopariidae
Kochiella sp. Poulsen 1927 trilobite
Rasetti, 1951
 Ptychopariida -
Syspacephalus crassus Rasetti 1951 trilobite
Kochaspis eiffelensis trilobite
Rasetti 1951
Schistometopus collaris trilobite
Rasetti, 1951
 Redlichiida - Dolerolenidae
"Alokistocare cleora" = Olenopsis cleora
"Alokistocare cleora" = Olenopsis cleora Walcott 1917 trilobite
Walcott 1917
 Kutorginida - Nisusiidae
Nisusia sp. Walcott 1905
 Cambridioida - Cambridiidae
Stenothecoides spp. Resser 1938
 Scenelloidea - Scenellidae
Scenella sp. Billings 1872