Last Glacial Maximum and deglaciation of devon island, arctic canada: support for an innuitian ice sheet

Regional variations in provenance and abundance of ice-rafted clasts in Arctic Ocean sediments: implications for the configuration of late Quaternary oceanic and atmospheric circulation in the Arctic

“…Three major circum-Arctic continental ice sheets existed. Ice sheets in north America covered northern Canada, the Laurentide ice sheet, and Greenland (Andrews, 1987;Dyke and Prest, 1989a,b;Dyke, 1999), the Eurasia ice sheet covered part of northern Russia and the Barents and Kara seas (Elverhøi et al, 1993;Polyak et al, 1995Polyak et al, , 1997Grosswald, 1998;Grosswald and Hughes, 1999;Siegert et al, 1999;Svendsen et al, 1999). The Late Weichselian glacial maximum reconstruction by Grosswald (1998) in the Barents and Kara Seas is considered by to be more than twice its actual size and Mangerud et al (1999) also indicate that most of the Kara Sea was unglaciated in the Late Weichselian.…”

Subglacial drainage patterns of Devon Island, Canada: Detailed comparison of river and tunnel valleys

“…Devon Island was covered by an extensive Innuitian ice sheet that reached its maximum extent during the last glacial maximum (e.g., England, 1987;Dyke, 1999;England et al, 2006). Shortly after the Younger Dryas, around 10 ka BP, the margin of this ice sheet was under recession to the current coast line, and the final remnants in central Devon Island vanished around 8.8 ka…”

“…BP (Dyke, 1999), leaving a landscape of plateaus, fiords and deeply incised canyons. We refer to the work by Dyke (1999) and England et al (2006) for a detailed discussion on the glacial history of the island during and since the Innuitian ice sheet.…”

“…We refer to the work by Dyke (1999) and England et al (2006) for a detailed discussion on the glacial history of the island during and since the Innuitian ice sheet. Since deglaciation, the landscape evolution is mainly the result of periglacial processes and erosion by ephemeral seasonal streams (e.g., McCann et al, 1972;Dyke, 1999). Fluvial incision represents only a small and highly localized contribution to the overall landscape evolution as a consequence of the island's polar desert climate conditions.…”

“…Aerial photography 20 obtained from the National Air Photo Library (National Resources Canada) of Devon Island reveals exposed tunnel valleys (Dyke, 1999) incised into the otherwise flat plateaus that comprise the majority of the topography on the island (typical slopes are 1 to 3 • ). These channels typically drain into deeply incised canyon systems that are believed to pre-date Innuitian glaciation (Dyke, 1999).…”