Government of Canada: Natural Resources Canada
 
 
Geological Survey of Canada
Calgary

 

 

Readme
Abstract
Overview
Citation
Metadata
Licence Agreement
Trademarks
Cover Photo
Acknowledgements
SHAPE Metadata
EXPORT Metadata
DXF Metadata

 

The Central Foreland NATMAP Project

 

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.