Correlation of Wisconsin glacial events between the Eastern Great Lakes and the St. Lawrence Lowlands

Abstract

The interrelationship of the Wisconsin glaciogenic events among the Upper St. Lawrence Lowland and the eastern Great Lakes, particularly the Lake Ontario basin is controlled mainly by 3 factors: 1) presence or absence of a glacial dam across the St. Lawrence Lowland; 2) isostatic lowering or rise of the outlet of Lake Ontario, related mainly to glacial loading or unloading in the Upper St. Lawrence Lowland; 3) shifting in the regional direction of glacial movement through the Upper St. Lawrence Lowland, upglacier from it, and in the Lake Ontario basin. Changes in the above conditions result in detectable changes in lake levels, and in compositional changes of tills in the Lake Ontario basin. Crosschecking of the above relationships supports the relative sequence already proposed. However, the chronology of the events which are older than reliable finite 14C dates, may be reinterpreted by a comparison with oceanic stratigraphies. A possible re-interpretation of some late-glacial Late Wisconsin glacial fluctuations depends greatly upon the reliability of 14C dates on shells and correct interpretation of till-like deposits. For those glacial fluctuations in the St. Lawrence Lowlands which lack 14C dates, it is tempting to apply correlations with the 14C dated stratigraphie units of the Great Lakes Region, but we have to consider also possible regional differences in glacial dynamics.

Marine‐Calibrated Chronology of Southern Laurentide Ice Sheet Advance and Retreat: ∼2,000‐Year Cycles Paced by Meltwater–Climate Feedback

“…The Lomb–Scargle periodogram (Lomb, 1976; Scargle, 1982; VanderPlas, 2018) of these data displays a 1.63 kyr peak (Figure S2 in Supporting Information ). Terrestrial data from glacial deposits constrain a 2.2 ± 0.7 kyr ice advance–retreat period (see references in Table 1 as well as Willman & Frye, 1970; Dreimanis & Karrow, 1972; Johnson et al., 1997; Karrow et al., 2000; Larson & Kincare, 2009; Larson, 2011).…”

Chronologie 14C des événements paléogéographiques du Québec depuis 14 000 ans

“…Des dates récentes (LOCAT, 1976;LEBUIS et DAVID, 1977;DIONNE, 1977) confirment l'ancienneté de la mer de Goldthwait sur la rive S du golfe du Saint-Laurent (DIONNE, 1972). Cette fluctuation majeure semble être en corrélation avec l'interstade de Cary -Port Huron (Mackinaw) de la région des Grands Lacs, daté vers 13 300 BP (EVENSON ef al., 1976;DREIMANIS, 1977).…”

Dynamique de l’Inlandsis laurentidien du Sangamonien à l’Holocène

“…Dans la région des Grands Lacs, de latitudes moyennes, l'insolation estivale commence à s'abaisser dès 40 ka. Le retrait glaciaire relatif est interrompu par des récurrences ou des rééquili-brations (DREIMANIS, 1977). Des lobes provenant de zones différentes attestent de la proximité des masses de l'inlandsis.…”