Title Surficial geology, Lichen Creek, British Columbia
Author Smith, I.R.
Source Open-File Report - Geological Survey of Canada, No.5309 1 disc. Publisher: Geological Survey of Canada, Calgary, AB, Canada
Publication Date 2009
Notes In English. Accessed on Aug. 12, 2011 GeoRef Acc. No: 309756
Index Terms alluvium; glacial geology; maps; Quaternary deposits; sediments; Canada-- British Columbia; British Columbia; Canada; Cenozoic; clastic sediments; fluvial features; glacial features; glacial geology maps; lacustrine features; Lichen Creek; moraines; Quaternary; surficial geology; till; Western Canada
Abstract Lichen Creek (NTS 94I/14) map area was inundated by the Laurentide Ice Sheet during the late Wisconsinan glaciation (ca. 25000- 10000 years ago). A thick blanket of clay and fine-silt-rich till was deposited across most of the region by westward flowing ice; glacial flow direction is depicted by flutings that show divergent flow directions around a bedrock headland in the southeast part of the map. Bedrock is also exposed beneath till veneer in a road cut and borrow pit in the north-central map area. Till exposures in regional borrow pits exhibit thicknesses 4 m, and the presence of clast- pavements and other unconformities suggests considerable thrusting and stacking of till sheets has occurred in this area. The area is flat to gently northward inclined, and is extensively blanketed by bog and fen deposits. Areas of hummocky peatland and thermokarst are present but generally less extensive here than in adjoining map areas; discontinuous permafrost conditions are likely to exist in the map area. Hummocky areas extending only a few metres above the regional organic terrain are covered by an aspen-dominated Boreal forest cover. Regional patterns of these forested-hummocks correlate with interpreted crevasse-squeeze ridges, and small, discontinuous recessional moraines that mark the east-southeastward retreat of ice. Lateral meltwater channels that run oblique and perpendicular across the bedrock- cored upland in the southern part of the map indicate that ice persisted to the south of the Lichen Creek map after the northern and central regions were deglaciated. No new granular aggregate resources were discovered in the map area, although the various galiofluvial terraces (Gt) in the northwest and along the Sahtaneh River may be candidates for field exploration. The esker complex in the northwest corner is comprised of almost entirely sand and therefore offers little aggregate potential. Bedrock exposed in the region is poorly consolidated Shaftesbury Formation shale, and similarly offers little granular aggregate potential.
URL http://apps1.gdr.nrcan.gc.ca/mirage/mirage_list_e.php?id=247303
Publication Type map
Record ID 65006356