GEOSCAN Search Results: Fastlink


TitleReconnaissance surficial geology, Tammarvi River, Nunavut-Northwest Territories, NTS 66-D
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorKerr, D
SourceGeological Survey of Canada, Canadian Geoscience Map 454, 2023, 1 sheet, Open Access logo Open Access
PublisherNatural Resources Canada
Maps1 map
Map Info.surficial geology, sediments, landforms and features, 1:125,000
ProjectionUniversal Transverse Mercator Projection, UTM zone 13 (NAD83)
Mediaon-line; digital
RelatedNRCan photo(s) in this publication
RelatedThis publication is related to the following publications
File formatreadme
File formatpdf; rtf; gdb (ESRI® ArcGIS(TM) v.10.x); shp (ESRI® ArcGIS(TM) v.10.x); xml (ESRI® ArcGIS(TM) v.10.x); mxd (ESRI® ArcGIS(TM) v.10.x); xls (Microsoft® Excel® 2010)
ProvinceNorthwest Territories; Nunavut
AreaTammarvi River
Lat/Long WENS-104.0000 -102.0000 65.0000 64.0000
Subjectssurficial geology/geomorphology; organic deposits; eolian deposits; alluvial deposits; lacustrine deposits; glaciolacustrine deposits; glaciofluvial deposits; glacial deposits; till deposits; bedrock geology; thermokarst; ice wedges; pingos; dunes; terraces; kettles; meltwater channels; moraines; kames; eskers; drumlinoids; drumlins; crag and tail; striations; Dubawnt Lake Ice Stream; Quaternary
Illustrationslocation maps; photographs
ProgramClimate Change Geoscience Permafrost
Released2023 10 19
AbstractPreliminary surficial geology studies, based on air photo interpretation and limited legacy field data in the Tammarvi River map area, provide an understanding of the nature of surficial materials and regional glacial history. The glaciated landscape records evidence of old southwestward ice flow, preserved in the extreme southwest, followed by younger dominant northwestward flow across the rest of the region, relating to the Dubawnt Lake Ice Stream. Northwest trending streamlined till and associated fluted landforms record the last flow event, but subsequent ice stagnation resulted in the widespread deposition of hummocky till and rare major moraine ridges in the north, accompanied by formation of ridged till and subglacial meltwater activity. The end of deglaciation is defined by the formation and demise of glacial Lake Thelon, whose extent in the southern and east-central map regions can be inferred from the elevation of deltas (230 to 160 m) and beaches (230 to 130 m).
Summary(Plain Language Summary, not published)
The map identifies surficial materials and associated landforms left by the retreat of the last glaciers. The surficial geology is based on aerial photograph interpretation. This work provides new geological knowledge and improves our understanding of the distribution, nature and glacial history of surficial materials. The map supports informed decision making for resource assessments, development, and effective land use management.

Date modified: