Nature, Origin, and Age Relationships of Landscape Complexes in Southwestern Saskatchewan

Abstract

Le 150e anniversaire de la Commision géologique du Canada Volume 46, numéro 3, 1992 URI : id.erudit.org/iderudit/032920ar

Palaeo‐ice streams and the subglacial landscape mosaic of the North American mid‐continental prairies

“…Limited published measurements of glacial striations on boulder pavement, as well as of glaciotectonic structures, were also used (e.g. Meneley 1964; Stauffer et al 1990; Klassen 1991, 1992a,b; Aber 1993).…”

“…Our motivation originates from the many studies and mapping programmes in the Prairies (e.g. Sedimentary Resources 1986; Shetsen 1987, 1990; Klassen 1991, 1992a, b; Simpson 1997), which collectively reveal a complex landscape mosaic with numerous contrasting landform orientations and inferred ice‐flow patterns. To our knowledge, these patterns have not yet been looked at within the framework of the ice‐stream paradigm.…”

Tertiary fluvial gravels and evolution of the Western Canadian Prairie Landscape

“…Quaternary ice sheets were deflected around the Cypress Hills and Wood Mountain Upland. The ice was relatively thin and parts of the uplands escaped glaciation all together (Klassen, 1992(Klassen, , 1994. Recent erosion is limited to slumping along current river Fig.…”

“…0n the west side of the Cypress Hills, elevation of the gravels is at 1463m, whereas, on the east side of the Cypress Hills, 160km distant, the gravels are at 1128m. The tops of the Cypress Hills were not glaciated (Klassen, 1992(Klassen, , 1994.…”

“…The Late Tertiary drainage systems remained relatively stable until the major disruptions caused by continental glaciation starting about upper Middle Pleistocene time (∼ 0.4 Ma). Radiocarbon dates indicate that the last glaciation in the area occurred from ∼ 23ka to ∼ 12 ka BP (Klassen, 1992).…”