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amphibolite Arctic argillite base Basin beds belt biotite Burgeo Burgeo granite Cambrian Canada Canadian chlorite clasts coarse grained conglomerate Current Research deformation Department of Mines deposits Devonian dikes diorite dykes eastern equigranular facies faults feldspar felsic Figure folds foliation fossil fractures Francois granite Geological Survey gneiss granite granitoid granodiorite Grenville Grey River Group Highlands hornblende indicate intrusive Island K-feldspar Lake layers limestone lithologies locally located lower Mackenzie mafic map area marine medium grained metamorphic metasedimentary migmatite Mineral Mines and Energy mudstone mylonite Newfoundland nord northern northwest Nova Scotia occur Ontario Ordovician outcrop overlying Paper permafrost phase plagioclase pluton pollen Pond porphyritic Precambrian profiles quartz regional Report Road River samples sandstone schist sedimentary sediments sequence shale siltstone southern strata stratigraphic structures Survey of Canada tectonic thick tuff U-Pb unit upper veins volcanic rocks zircon zone