
ABSTRACT
A GIS dataset of geological features for the
Mount McCusker map area (94G/4), Peace River-Cassiar District, British Columbia.
Abstract: The geological map and database are derived from regional
mapping in the
Mount McCusker (NTS 94G/4) 1:50 000 scale map area, as part of the
Geological Survey of Canada's Central Foreland NATMAP project.
Geological features represented by attributed points, lines, and
polygons
have been compiled into a GIS dataset suitable for stand-alone
use, or integration with other data sets. User-defined attributes
provide traditional geological map information with greater detail and
enhancements.
The Mount McCusker map area
encompasses the transition from the Foothills to the
Main Ranges of the northern Rocky Mountains of
northeastern
British Columbia. The Foothills are underlain by late Paleozoic and Mesozoic
rocks that are deformed into long linear folds with minor thrust faults, all
detached on a basal decollement in the underlying Besa River Formation. The
Main Ranges in the western part of the map area are
underlain by early Paleozoic limestones, dolostones and quartzites
emplaced by large,
shallow-dipping thrust faults onto the Besa River Formation. The dolostones
are internally deformed by smaller thrust faults. The limestones
contain tight overturned folds with penetrative cleavage. Whereas the early
Paleozoic rocks are dominated by thick panels of carbonate rocks, the late
Paleozoic and younger units are dominated by clastic rocks with subsidiary but
economically significant carbonates in the Carboniferous Prophet (Debolt)
Formation and the Triassic Charlie Lake, Baldonnel and Pardonet
formations. Broad glacially scoured river valleys cut through the
ranges.
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