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TitleReconnaissance surficial geology, Mara River, Nunavut, 76-K
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorKerr, D E
SourceGeological Survey of Canada, Canadian Geoscience Map 445, 2022, 1 sheet, Open Access logo Open Access
LinksSurficial geology map collection
LinksCollection de données de géologie de surface
PublisherNatural Resources Canada
Maps1 map
Map Info.surficial geology, sediments, landforms, features, 1:125,000
ProjectionUniversal Transverse Mercator Projection, UTM zone 12 (NAD83)
Mediadigital; on-line
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)
AreaMara River
Lat/Long WENS-110.0000 -108.0000 67.0000 66.0000
Subjectssurficial geology/geomorphology; paleontology; Nature and Environment; Science and Technology; postglacial deposits; marine sediments; organic deposits; landslides; talus; raised beaches; deltas; alluvial fans; dunes; glacial deposits; glacial landforms; glacial features; glacial lakes; tills; moraines; moraine, ribbed; proglacial lakes; ice contact deposits; eskers; glacial flutings; glacial scours; kettles; meltwater channels; paleocurrents; kames; drumlinoids; drumlins; crag and tail; glacial striations; glacial history; glaciation; deglaciation; ice flow; isostatic rebound; emergence; paleodrainage; permafrost; ground ice; periglacial features; thermokarst; patterned ground; ice-wedge polygons; felsenmeer; solifluction; gossans; landforms; escarpments; scarps; buried valleys; fossils; snowpacks; icings; eolian sediments; colluvial and mass-wasting deposits; alluvial sediments; alluvial floodplain sediments; alluvial terraced sediments; lacustrine sediments; lacustrine deltaic sediments; lacustrine littoral sediments; marine terraced sediments; marine beach sediments; marine deltaic sediments; marine veneer; marine blanket; glaciomarine sediments; glaciomarine beach sediments; glaciomarine deltaic sediments; glaciomarine blanket; glaciolacustrine sediments; glaciolacustrine beach sediments; glaciolacustrine deltaic sediments; glaciofluvial sediments; glaciofluvial outwash plain sediments; glaciofluvial terraced sediments; glaciofluvial outwash fan sediments; esker sediments; hummocky tills; ridged tills, moraine; streamlined tills; till veneer; till blanket; subglacial meltwater corridors; geological contacts; landslide scars; thermokarst depressions; dune crests; terrace scarps; beach crests; limit of submergence, glaciolacustrine; moraine ridges; ice-contact scarps; esker ridges; drumlinoid ridges; drumlin ridges; crag-and-tail ridges; pre-crag ridges; ice-flow directions; fluted drift; fluted bedrock; outcrops; station locations, remote observation; station locations, ground observation; Phanerozoic; Cenozoic; Quaternary
Illustrationslocation maps; index maps; aerial photographs
ProgramClimate Change Geoscience Coastal Infrastructure
Released2022 05 17
AbstractThe Mara River map area consists of extensive glacially and meltwater scoured bedrock, deposits of hummocky till, fluted till blanket, and till veneer throughout the map area, glaciofluvial sediments within major river valleys, and postglacial marine sediments in coastal lowlands. The boundaries of many till deposits were eroded to bedrock by proglacial and subglacial meltwater, and locally northwest-trending corridors are defined by eskers. Glacially dammed lakes, associated with deltas between 450 m and 230 m elevation, occupied some river valleys where retreating or stagnant ice impeded drainage to the east and north. Striations and streamlined landforms indicate a north-northwestward regional ice flow in the eastern and northern regions, diverging to a west-southwestward flow in the western regions. A series of glaciomarine and marine deltas, and fine-grained sediments record the marine incursion up to 200 m elevation. Isostatic rebound caused marine regression, forming deltas between 200 m and 60 m, and raised beaches from 150 m elevation to current sea level.
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 and limited fieldwork. 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.

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