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TitleSurficial geology of Victoria and Stefansson islands, District of Franklin
AuthorFyles, J G
SourceGeological Survey of Canada, Bulletin 101, 1963, 38 pages (1 sheet),
PublisherGeological Survey of Canada
MapsPublication contains 1 map
Map Info.surficial geology, 1:1,000,000
Mediapaper; digital; on-line
File formatpdf
ProvinceNorthwest Territories; Nunavut
NTS67; 68; 77; 78; 87; 88
AreaVictoria Island; Stefansson Island; Banks Island; District of Franklin
Lat/Long WENS-120.0000 -100.0000 74.0000 68.0000
Subjectssurficial geology/geomorphology; geochronology; beach ridges; cols; drumlinoids; eskers; glacial deposits; ice movements; lacustrine deposits; meltwater channels; misfit channels; moraines; pingos; radiocarbon dates; strandlines; till plains; wisconsinian glacial stage; glacial landforms; glaciation; postglacial deposits; Phanerozoic; Cenozoic; Quaternary
Illustrationssketch maps
Released1963 01 01; 2015 08 20
AbstractVictoria and Stefansson Islands lie within the northwestern part of the region overridden by the Laurentide ice-sheet during the last (classical Wisconsin) glaciation. In general, the ice-sheet flowed northwestward across the islands, although the pattern of movement was highly complex in detail. The regional relationships of moraines, drumlinoid features, eskers, meltwater channels, and glacial lakes point to progressive glacial retreat from north to south and from west to east.
Large morainal complexes in western Victoria Island border broad depressions now occupied by arms of the sea. These moraines accumulated along the margins of residual active ice-tongues that occupied the depressions during and after deglaciation of adjoining higher ground. Beneath the morainal deposits are widespread gravels, sands, and silts; in one place, such strata yielded tundra vegetation 28,000 radiocarbon years old. Drumlinoid features dominate the landscape of Stefansson Island and of the central and eastern lowland of Victoria Island. The complex, curving, divergent, and convergent drumlin trends probably record successive changes of ice-flow direction during thinning of the ice-sheet.
Prominent marine features record post-glacial submergence of large parts of the present lowlands. The highest earliest marine level now increases in altitude from 250 or 300 feet in the north and northwest to 600 feet or more in the southeast. Radiocarbon dates suggest that the initial maximum submergence decreased in age from northwest to southeast, and that most of the subsequent uplift took place early in post-glacial time.