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- W4384338478 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> The timing of the Laurentide Ice Sheet’s final retreat from North America’s Laurentian Great Lakes is relevant to understanding regional meltwater routing, changing proglacial lake levels, and lake-bottom stratigraphy following the Last Glacial Maximum. Recessional moraines on Isle Royale, the largest island in Lake Superior, have been mapped but not previously dated. Here, we use the mean of ten new <sup>10</sup>Be exposure-ages of glacial erratics from two recessional moraines (10.1 ± 1.1 ka, one standard deviation; excluding one anomalously young sample) to constrain the timing of Isle Royale’s final deglaciation. This <sup>10</sup>Be age is consistent with existing minimum limiting <sup>14</sup>C ages of basal organic sediment from two inland lakes on Isle Royale, a sediment core in Lake Superior southwest of the island, and an estimated deglaciation age of the younger of two subaqueous moraines between Isle Royale and Michigan’s Keweenaw Peninsula. Relationships between Isle Royale’s landform ages and Lake Superior bottom stratigraphy allow us to delineate the retreat of the Laurentide ice margin across and through Lake Superior in the early Holocene. We suggest Laurentide ice was in contact with the southern shorelines of Lake Superior later than previously thought." @default.
- W4384338478 created "2023-07-15" @default.
- W4384338478 date "2023-07-14" @default.
- W4384338478 modified "2023-10-18" @default.
- W4384338478 title "Comment on gchron-2023-16" @default.
- W4384338478 doi "https://doi.org/10.5194/gchron-2023-16-rc1" @default.
- W4384338478 hasPublicationYear "2023" @default.
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