A single, late Wisconsin, Laurentide glaciation, Edmonton area and southwestern Alberta

The Laurentide and Innuitian ice sheets during the Last Glacial Maximum

“…Bobrowski and Rutter (1992) concluded, therefore, that coalescence did not occur in that region during the last glaciation. Because the last glaciation is thought by them and by others (e.g., Liverman et al, 1989;Young et al, 1994) to be the only Laurentide glaciation to have reached western and southern Alberta, the two ice sheets may never have coalesced in this part of the 'ice-free corridor'. It is, however, difficult to conceive of how the two ice sheets might have flowed in coalescence for nearly 1000 km southward along the erratics train while remaining separated northward from the head of the train.…”

Differences between the last two glacial maxima and implications for ice-sheet, δ18O, and sea-level reconstructions

“…For the Cordilleran Ice Sheet (contributing to our broad NAIS interpretation), continental-ice presence is documented in NW Canada and Alaska only for the Late Pleistocene (i.e., post-PGM). The sedimentary record captures a succession of plateau/montane glaciations (often successively less extensive than the previous), but only a single continental glaciation (Liverman et al, 1989;Jackson et al, 1991;Young et al, 1994;Harris, 2005;Barendregt and DukRodkin, 2011;Clague and Ward, 2011;Turner et al, 2013). Uncertain, and often inconsistent age control again hinders correlation of these pre-LGM glaciations (e.g., .…”

Geoarchaeology of Palaeo-American Sites in Pleistocene Glacigenic Deposits

“…40 000-21 000 yr BP in central Alberta near Edmonton ca. 300 km north of Calgary overlain by a till of this continental glaciation (Young et al, 1994). In view to its stratigraphic position beneath the Glacial Lake Calgary sediments, this more recent cultural horizon at Site 1 clearly predates formation of the glacial, ice-marginal basin.…”