Interglacial Biotas from the North Atlantic Islands

Bennike, Ole; Böcher, Jens

doi:10.1002/9781118561461.ch3

Cited by 1 publication

(1 citation statement)

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“…Erratic boulders on the Cape Aston Delta have cosmogenic exposure ages indicating deposition by cold‐based Laurentide ice during the LGM (Davis et al 2006), confirming overriding by cold‐based LGM ice without erosion. Comparable geological evidence from northwest Greenland indicates cold‐based LGM ice cover and similar preservation of pre‐LGM landscapes in some settings (Bennike and Böcher, 2021; Kelly et al 1999, Corbett et al 2016, Farnsworth et al 2018). Widespread evidence demonstrating landscapes inundated by both Laurentide and Greenland ice sheets remained unmodified by the overriding ice, opens the possibility that lacustrine sediment might be preserved over multiple glacial cycles (Fig.…”

Section: Preservation Of Ancient Landscapes Beneath Continental Ice S...mentioning

confidence: 95%

Last interglacial lake sediments preserved beneath Laurentide and Greenland Ice sheets provide insights into Arctic climate amplification and constrain 130 ka of ice‐sheet history

Miller

Wolfe

Axford

et al. 2022

J Quaternary Science

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Sediment cores from 13 lakes in a 1500 km transect along the eastern North American Arctic contain up to four superposed stratified interglacial units. All 13 lakes contain one unit with sediment similar in character and mass to Holocene gyttja, with 14C ages >40 ka, luminescence ages 90 to 120 ka, and pollen assemblages that require nearly complete Laurentide deglaciation, supporting a Last Interglacial (LIG; MIS 5e) age. Two lakes preserve an older interglacial, with luminescence ages suggesting an MIS 7 age. Four adjacent lakes record a thin, stratified organic unit between the LIG and Holocene units with 14C ages >50 ka, that is probably from late in MIS 5. Temperature estimates from biotic proxies suggest LIG summer temperatures 4–6°C above mid‐20th century values; pollen, chironomids and DNA document a poleward expansion of woody plants and invertebrate species during the LIG, supporting arguments that positive feedbacks native to the Arctic amplified insolation‐driven summer temperature increases. The stratigraphic succession implies the Laurentide Ice Sheet remained intact with sea level below ‐40 m from ~115 ka to ~11 ka, and places new constraints on the interpretation of cosmogenic radionuclide inventories in erratic boulders older than the Holocene throughout this region.

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