00000nem 2200000za 4500 9.575829 CaOODSP 20230131161133 m go c f cr ||||||||||| 150406s2013 onc bd a fo 0 eng d 978-1-100-21745-1 CaOODSP eng n-cn-nt n-cn-nu M183-1/112-2013E-PDF Veillette, Jean. Surficial geology, Brock River, Northwest Territories-Nunavut, NTS 97-D [electronic resource] / [by] J.J. Veillette, D.A. St-Onge and D.E. Kerr. Preliminary version Scale 1:250,000 Ottawa : Natural Resources Canada, c2013. 1 map : col. Canadian geoscience map ; No. 112 Includes a legend. Includes bibliographical references. "The highest central regions of the Brock River map area were covered by active ice moving from the southeast, although exact ages of advance(s) are unknown. Deglaciation of parts of the high interior may have started in early Wisconsinan, and may have been free of active ice in middle Wisconsinan time or earlier. Evidence of ice-free conditions is limited. Fluctuating cover of thin ice, probably cold based, may have survived for extensive periods during the Wisconsinan. It disappeared in Late Wisconsinan, leaving widespread kames and ice-contact deposits overlying surficial sediments and bedrock. Till is widespread at all elevations. In the high interior, it is locally mixed with felsenmeer and isolated kames. Glaciofluvial deposits are concentrated along major river valleys. Postglacial fluvial erosion along the Brock River carved bedrock canyons up to 150 m deep. The upper Roscoe River is broad with sweeping meanders and terraces deeply incised into thick morainal deposits. Coastal regions have marine sediments associated with the postglacial sea"--Abstract. Includes abstract in French. 13-21 2013-05-24 gccst Geological maps gccst Rivers gccst Surficial geology St-Onge, Denis A. (Denis Alderic), 1929- Kerr, Daniel Ernest, 1961- Canada. Natural Resources Canada. Geological Survey of Canada. Canadian geoscience map ; No. 112. (CaOODSP)9.506260 PDF 7.46 MB https://publications.gc.ca/collections/collection_2013/rncan-nrcan/M183-1-112-2013-eng.pdf HTML N/A https://doi.org/10.4095/292246 292246