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![The Central Foreland NATMAP Project](images/pagetop.gif)
ABSTRACT A GIS dataset of geological features for the
Etanda Lakes map area
(95C/16), Northwest Territories and Yukon
Territory.
Abstract: The geological map and database are
derived from regional
mapping in the Etanda Lakes (NTS 95C/16) 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, location and description of curated
samples, and lithologies at visited outcrops.
The Etanda Lakes map area is
situated at the southern end of the
Franklin Mountains encompassing the Liard Range and the convergence
of the Kotaneelee, La Biche, and Tlogotsho Ranges. The geology of the
area is characterised by sedimentary strata, of Late Devonian to Early
Cretaceous age, exposed in a series of asymmetrical box or kink folds whose geometry is
controlled largely by the competence of the Carboniferous
Mattson Formation. Structure in the area is dominated by the culmination of
the Etanda Dome where several anticline trends converge. In the eastern part
of the map area the Liard Range exposes a series of closely spaced box
folds locally imbricated by thrust faults of minor displacement. The
trend of structures in the Liard Range varies from NNW to NNE, following
the curve of the range. Lower Cretaceous strata of the Kotaneelee
syncline occupy the valley shared by Chinkeh Creek and Jackfish River.
Stratigraphic features include the westward shale-out of the Flett and
Prophet Formations into the Besa River Formation and the sub-Cretaceous
unconformity, which cuts out Permian strata to the north and east. The
distinctive Chinkeh Formation at the base of the Cretaceous succession
was mapped on both sides of the Kotaneelee Syncline.
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