The Sangamonian Stage and the Laurentide Ice Sheet

St-Onge, Denis A.

doi:10.7202/032678ar

Cited by 15 publications

(6 citation statements)

References 32 publications

(17 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…the ~20 m of sea level equivalent modelled by Stokes et al, 2012), it had shrunk rapidly by 100 ka (MIS 5c) (cf. St-Onge, 1987), and likely existed only as a small, thin ice sheet over the original inception grounds in north-eastern Canada by ~80 ka (MIS 5a) (Marshall et al, 2000;Stokes et al, 2012). Thereafter, the LIS is thought to have grown rapidly during MIS 4, reaching a maximum extent around 65 ka (Vincent and Prest, 1987;Marshall et al, 2000;Kleman et al, 2002;Stokes et al, 2012), which coincides with the oldest recognised Heinrich event (H6) and a marked increase in ice-rafted debris from that time (Kirby and Andrews, 1999;Hemming, 2004, Bassis et al, 2017.…”

Section: Inception and Build-up To Its Last Glacial Maximummentioning

confidence: 99%

Deglaciation of the Laurentide Ice Sheet from the Last Glacial Maximum

Stokes

2017

CIG

View full text Add to dashboard Cite

ABSTRACT. The last deglaciation of the Laurentide Ice Sheet (LIS) was associated with major reorganisations in the ocean-climate system and its retreat also represents a valuable analogue for understanding the rates and mechanisms of ice sheet collapse. This paper reviews the characteristics of the LIS at its Last GlacialMaximum (LGM) La deglaciación del inlandsis Lauréntide desde el Último Máximo Glaciar RESUMEN. La última deglaciación del inlandsis Lauréntide (LIS) estuvo relacionada con grandes reorganizaciones en el océano-clima y su retroceso representa un valioso ejemplo para comprender las tasas y mecanismos del colapso del inlandsis. Este artículo revisa las características del LIS en su Último Máximo Glaciar (LGM) y su consiguiente deglaciación, con especial énfasis en

show abstract

Section: Inception and Build-up To Its Last Glacial Maximummentioning

confidence: 99%

Deglaciation of the Laurentide Ice Sheet from the Last Glacial Maximum

Stokes

2017

CIG

View full text Add to dashboard Cite

show abstract

“…Although variable, the Sangamonian stage provided a favourable environment for soil development. According to St-Onge's (1987) interpretation of the oxygen isotope record (Fig. 2a), the climate was somewhat cooler in oxygen isotope stage 5a, cooler still in stage 5c, and colder in stages 5b and 5d than it is now.…”

Section: Late Pleistocene Paleosolsmentioning

confidence: 93%

Paleosols of the Interglacial Climates in Canada

Tarnócai¹

2007

gpq

View full text Add to dashboard Cite

ABSTRACTAlthough paleosols are useful indicators of paleoclimates. it is first necessary to establish the relationships between the northern limits of the various contemporary soils and the pertinent climatic parameters. It is then necessary to determine the age of the various paleosols and, if possible, their northern limits. Comparison of the distribution and northern limits of the contemporary soils with the distribution and northern limits of the analogous paleosols then permits the reconstruction of the paleoenvironments. For the purposes of comparison the mean annual temperature of the Old Crow area during the Pliocene epoch was also determined (about 4°C) even though this was not an interglacial period. It was found that during the pre-lllinoian interglacial periods the central Yukon had a mean annual temperature of about 7°C while during the Sangamonian interglacial period it had a mean annual temperature of about - 3°C. During the Holocene epoch, the current interglacial period, the climate has been similar to or only slightly cooler than that existing during the Sangamonian interglacial period. The fluctuating position of the arctic tree line (and associated forest soils) during the Holocene epoch, however, indicates that the climate has also been fluctuating during this time. The paleoclimatic reconstruction presented in this paper also relies heavily on both diagnostic soil features and the soil development during the various interglacial periods.

show abstract

“…Workers have usually established relative age frameworks on the assumption that a specific glacial event took place at an indeterminate time after the deposition of nonglacial beds sometime during the Sangamonian (stage 5; 130-80 ka BP 2 ) and before the deposition of nonglacial interstadial beds at sometime during the Middle Wisconsinan (stage 3; 65-23 ka BP). Although the largest marine isotopic excursion during the period between substage 5e and stage 2, occurred during stage 4 (Early Wisconsinan; 80-65 ka BP), some authors speculate that the Laurentide Ice Sheet may have developed during the Sangamonian sensu lato (substages 5a-5d; see ST-ONGE, 1987) and may still have been present over large areas during the Middle Wisconsinan (see DREDGE and THORLEIFSON. 1987).…”

Section: Introductionmentioning

confidence: 99%