Also known as R-21

Where: British Columbia, Canada (49.6° N, 122.0° W: paleocoordinates 49.4° N, 74.4° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Brokenback Hill Formation, Middle Albian (109.0 - 105.3 Ma)

• GENERAL DATA: The Brokenback Hill Fm ranges from upper Valanginian to middle Albian in age. All colllections have relatively fine temporal resolution however due to ammonite biostratigraphy. SPECIFIC AGE DATA: Cleoniceras perezianum (Whiteaves) is regarded as Middle Albian. This occurrence is significant as it documents for the first time the eastward extension of marine rocks of the Gambier Group eastward into the Harrison Lake area. These rocks were previousl believed to be restricted to the very poorly understood mid-Cretaceous basin of the Gulf of Georgia (see Jeletzky, 1976, 1977)

• bed-level stratigraphic resolution

Environment/lithology: offshore; lithified, tuffaceous sandstone

Size class: macrofossils

Preservation: cast, mold/impression

Reposited in the GSC

Collection methods: surface (in situ),

• Collected and initially identified by Tipper (pers. comm.), and later published by Ray and Coombes (1984). Collection presumably reposited in the GSC.

Primary reference: A. J. Arthur, P. L. Smith, J. W. H. Monger and H. W. Tipper. 1993. Mesozoic stratigraphy and Jurassic paleontology west of Harrison Lake, southwestern British Columbia. Geological Survey of Canada Bulletin 441:1-62 [A. Miller/A. Hendy/M. Clapham]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 57082: authorized by Austin Hendy, entered by Austin Hendy on 01.12.2005

Creative Commons license: CC BY (attribution)