Mount Mark Formation, Buttle Lake Group, Upper Pennsylvanian (Virgilian), Rift Creek, Vancouver Island, B. C.
Brachymetopus cf. pseudometopina Gauri and Ramovs
The first trilobites found on Vancouver Island include the brachymetopine Brachymetopus cf. pseudometopina Gauri and Ramovs, and the ditomopygine Paladin sp. These were described and illustrated for the first time by Bill Hessin and are from the Mount Mark Formation, Buttle Lake Group, exposed at Rift Creek. Only partials are known so far. A diverse invertebrate fauna is associated with these trilobites and is represented by at least 54 taxa distributed amongst the following groups: Porifera, Rugosa, Tabulata, Gastropoda, Bivalvia, Malacostraca, Bryozoa, Brachiopoda, Blastoidea and Crinoidea. This fauna, especially the brachiopods, the blastoid Agmoblastus and the trilobites, indicate a late Pennsylvanian age for the Mount Mark Formation in this area.
Hessin, W.A. 1997. in Program and Abstracts. Second British Columbia Paleontological Symposium.