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ABSTRACT Abstract: This geological map and database are derived from regional mapping in the Kluachesi Lake (NTS 94G/13) 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 such as explicit orientation data, lithologies, and sample localities.
The Kluachesi Lake map area is situated within the Rocky Mountain
Foothills of the Foreland Belt in northeast British Columbia. The
geology of the area is dominated by folded strata of Devonian through
Cretaceous age. At this latitude the foothills narrow to a band 25 km
wide with a dominant north-northwest trend. The most notable fold
structure is the Muskwa Anticlinorium, delineated by exposures of the
Carboniferous Prophet Formation in the central portion of the map area. This
relatively broad structure is approximately 10 km wide, and is further
modified by smaller folds with a wavelength of 1-2 km. Thrust faults with minor
offset (1 km or less) further complicate the structures, particularly
within the Prophet
Formation. One larger thrust fault, the Kluachesi Thrust, carries lower
Paleozoic carbonates over Triassic strata and marks the leading edge of
the Rocky Mountains on the west edge of the map. Type sections for the Besa River Formation and the Prophet Formation are also found in this
map area.
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