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Showing 1 to 19 of 19 for “"Laurentide Ice Sheet"”.
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Controls on the extent of the Laurentide Ice Sheet in Southern Illinois
… glaciation (~190,000 to 130,000 years ago), the Laurentide Ice Sheet of North America reached its southernmost extent in southern Illinois, covering approximately 90% of Illinois at the time. In this study, I seek to understand the factors that controlled the shape and extent of the Laurentide …
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Laurentide ice sheet meltwater influences and millennial-scale climate oscillations on the northwestern slope of the Gulf of Mexico during Marine Isotope Stage 6 and Termination II
… be explained by sea surface temperature (SST) or ice volume, but rather are a response to isotopically light glacial meltwater from the paleo-Mississippi river. This conclusion supports the studies of similar oscillations during Termination I and MIS 3.
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Glacial Geomorphology of southern Alberta, Canada
… from the Last Glacial Maximum three terrestrial ice streams within the south western sector of the Laurentide Ice Sheet competed and coalesced in southern Alberta; the High Plains Ice Stream (HPIS), Central Alberta Ice Stream (CAIS) and the east lobe. The ice streams are characterised by smoothed …
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Cone Penetration Testing and Hydrogeological Monitoring of a Retrogressive Landslide in Champlain Sea Clay
… transgression during the final retreat of the Laurentide ice sheet. Upon isostatic rebound, the watersheds incised deep river valleys throughout the Ottawa region. These sensitive clay river banks have been shown to be highly susceptible to large retrogressive landslides. A cone penetration …
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INSIGHTS INTO THE GENETIC DIVERSITY OF ASIMINA TRILOBA: A STUDY USING GENOME ASSEMBLY AND POPULATION GENETICS
… northern migration after the retreat of the Laurentide Ice Sheet. This research has important implications for understanding the mechanisms underlying genetic diversity in the species and conservation efforts.
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Tidally Forced Marine Ice Stream Instabilities and Their Consequences
… 10-kyr deglaciation. Since its discovery in ice cores recovered from Greenland, the rapid deglaciation has proven mysterious. I present a novel explanation for this phenomenon, wherein the deglaciation of the Laurentide ice sheet is accelerated by the rapid collapse of marine-terminating ice …
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A geochemical and paleoceanographic investigation using marine molluscs of the late Quaternary marine submergences Quebec, Ontario, British Columbia
… and reduced sal1nltles. Ttle eastern Laurentide Ice Sheet probably had an o:~ygen lS0tOP1C composition as low as -8e) 0/00 (Sr1[IW). In additl0fl} corrections need to be rnade to the carbonlsotope values, before salinity deterrnlnatlons are t11ade., due to the reJjuctlon of the …
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Deep-lake carbonates and speleothems as high-resolution archives of paleohydrology in the Bonneville Basin, UT
… that form beneath the surface of lakes in crevices and protected spaces. We explore these deposits as an archive of past hydrological change in the Bonneville Basin. Deep-lake carbonates deposits were collected from varying elevations in the basin and microsampled for U-Th dating. The results …
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Analysis of deposition, erosion, and landscape stability during the late Quaternary using multi-proxy evidence from Owl Creek, Central Texas, USA.
… that may reflect the advance and retreat of the Laurentide ice sheet and the southward displacement of the jet stream and ensuing wetter conditions as recorded by regional climate proxies. Compilation of the proxies presented shows evidence for a cooler and wetter late Pleistocene climate, …
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Refining the span and rates of deposition of the Glenwood phase of Lake Chicago
… as well as upstream contributions from the Laurentide Ice Sheet into Glacial Lake Chicago.
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A Reconstruction of Post-Glacial Hydroclimatic Change and Mass Accumulation Rates from a Small Watershed of the Lower North American Great Lakes Region
… the late Pleistocene to early Holocene, the Laurentide Ice Sheet forced the jet stream south, resulting in reduced precipitation. Following the ice sheet collapse, declining summer insolation as well as interactions between the atmosphere and ocean basins led to variable circulation patterns …
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Sedimentology and Stratigraphy of Glacial Lake Souris, North Dakota: effects of a glacial-lake outburst
… occurred along the southern margin of the Laurentide Ice Sheet as ice-marginal lakes suddenly drained. These outbursts released huge volumes of water with tremendous erosive potential, forming large trench-shape channels. Although glacial-lake spillways have been studied in detail, the …
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Reconstructing the depositional history of the Eel River paleo meltwater channel, northeastern Indiana using sediment provenance techniques
… originated from the Erie Lobe of the Laurentide Ice Sheet, but do contain some sediment from the Saginaw Lobe. This determination helps clarify the ice dynamics and Last Glacial Maximum sediment depostional history in northeastern Indiana, which is complicated because of the …
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Glacial geology of the Western Catskills
… during the decline and after the retreat of the Laurentide Ice Sheet were also unsubstantiated. The East and West Branches Delaware River had different styles of daglaciation. The West Branch is characterized by zones of stagnation. The length of a zone is controlled by relief of the valley and …
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Reflection seismic investigations of the Canadian Beaufort Sea margin, Arctic Ocean
… troughs, representing locations of former ice streams draining a 1000 km-long section of the Laurentide Ice Sheet (LIS), are examined: the Mackenzie, Amundsen Gulf and M'Clure Strait systems. These palaeo-ice streams operated during the last, Late Wisconsinan glacial maximum, as well as …
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Characterizing Provenance of the Late Wisconsinan Rainy Lobe Using Fine-Fraction Geochemistry and Detrital Zircon Geochronology
… which emanated from the Labradoran sector of the Laurentide ice sheet (LIS), is exposed at the surface from SW Minnesota to the extreme NE part of the State. The Rainy lobe advanced to its maximum limit in southwestern Minnesota well prior to the Last Glacial Maximum (ca. 27-30 ka BP) and …
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Wobbly winds in an ice age : the mutual interaction between the great continental ice sheets and atmospheric stationary waves
The ice sheets of the last glacial maximum (about 21 thousand years ago) covered a significant fraction of the high latitude land mass, reached up to 3km in height, and had length scales of thousands of kilometers. They represented significant obstacles to the westerly flow of the atmosphere. As …
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The geologic history of Lake of the Woods, Minnesota, reconstructed using seismic-reflection imaging and sediment core analysis
… on the location of the southern margin of the Laurentide Ice Sheet (LIS), the location and elevation of outflow channels, and differential isostatic rebound. Some of the best-preserved sequences of Lake Agassiz sediments are found in remnant lake basins where erosional processes are less …
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Subsurface Geophysical Investigations of Oneida Lake Ny: Insights Into Ice Sheet Processes and Deglaciation At Termination I
<p>Reconstructing the retreat of the Laurentide Ice Sheet (LIS) provides insight into understanding end-Pleistocene climate, a critical set of boundary conditions prior to the onset of Holocene climates that were optimal for human dispersal and societal growth. Constraining ice sheet dynamics, …