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arenite argillite Arnica Formation belt bioclastic black shale blue-grey Blusson brownish buff weathering calcareous shale Cambrian age Canol Road carbonate Caribou Pass changes facies chert clastic rocks commonly consists Cretaceous crypto-grained limestone dark grey dark recessive dark shale Delorme Formation Devonian District of Mackenzie Eifelian Epoch Formation faults fine-grained quartzite folded Formation or Group Gabrielse Geol Geological Survey grained green grey to black Headless Formation June Lake Keele River Landry Formation light grey weathering Lithology Thickness feet Lower Cambrian lower Paleozoic Mackenzie Mountains map-unit 27 Middle Cambrian minor mudstone Nahanni Formation Natla River northwest of Canol Northwest Territories orange-weathering dolomite Ordovician Paleozoic platy Proterozoic quartzite quartzites of unit Rapitan Group reefoid Road River Formation sandstone Sekwi Formation Sekwi Mountain map-area Selwyn Mountains sequence shaly siltstone Silurian southeast Surv Survey of Canada thick bedded thin thin-bedded unit 12 unit Lithology Thickness upper weathering dolomite west of Caribou Whittaker Formation Yukon Territory