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TitleBrock River map-area, District of Mackenzie (97D)
AuthorBalkwill, H R; Yorath, C J
SourceGeological Survey of Canada, Open File 40, 1970, 44 pages (3 sheets),
PublisherGeological Survey of Canada
Documentopen file
MapsPublication contains 1 map
Map Info.geological, 1:250,000
Mediapaper; on-line; digital
RelatedThis publication is superceded by the following publications
File formatpdf
ProvinceNorthwest Territories
AreaBrock River; District of Mackenzie
Lat/Long WENS-124.0000 -120.0000 70.0000 69.0000
Subjectsregional geology; stratigraphy; structural geology; surficial geology/geomorphology; economic geology; fossil fuels; paleontology; gravity interpretations; bedrock geology; lithology; sedimentary rocks; shales; dolomites; cherts; sandstones; siltstones; argillites; stromatolites; oolites; bentonite; gypsum; igneous rocks; intrusive rocks; gabbros; diabases; intrusions; dykes; sills; structural features; faults; folds; anticlines; synclines; glacial deposits; ice movements; physiography; correlations; fossils; Albian; Lower Cretaceous; Bear Rock Formation; Caledonian Orogeny; Coppermine Arch; Mount Cap Formation; Old Fort Island Formation; Ronning Group; Saline River Formation; Shaler Group; Phanerozoic; Cenozoic; Quaternary; Mesozoic; Cretaceous; Paleozoic; Devonian; Ordovician; Cambrian; Precambrian; Proterozoic
Illustrationsgeological sketch maps; photographs; stratigraphic charts; stratigraphic cross-sections
Natural Resources Canada Library - Ottawa (Earth Sciences)
Natural Resources Canada library - Vancouver (Earth Sciences)
Natural Resources Canada library - Calgary (Earth Sciences)
Geological Survey of Canada (Atlantic)
Released1970 01 01; 2016 12 20
AbstractGently folded, unmetamorphosed Upper Proterozoic (Hadrynian or Neohelikian) sedimentary rocks, with a total exposed thickness of about 6,000 feet, underlie most of the map-area; gabbro sills and dikes locally intrude the strata. Paleozoic marine sedimentary rocks, ranging from Cambrian to Middle Devonian, unconformably overlie the Proterozoic rocks. Exposed thickness of Paleozoic strata is about 1,700 feet. A regional hiatus separates the Paleozoic rocks and a sequence , about 700 feet thick, of Lower Cretaceous quartz sandstones, siltstones, shale, and coal. Thick, topographically prominent Pleistocene glacial deposits obscure bedrock throughout wide areas.
Northwesterly trending Coppermine Arch dominates the regional geologic structure. Proterozoic and Phanerozoic epeirogenesis is indicated by unconformities along and adjacent to the arch.