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Environmental interpretation of fossil insect assemblages from MIS 5 at Ziegler Reservoir, Snowmass Village, Colorado

Published online by Cambridge University Press:  20 January 2017

Scott A. Elias
Scott A. Elias*
Affiliation:
Geography Department, Royal Holloway, University of London, Egham, Surrey TW20 0EX, UK
*
E-mail address:[email protected]
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Abstract

Organic-rich lake sediments from a trench exposed at the Ziegler Reservoir fossil site near Snowmass Village, Colorado yielded a sequence of 27 insect fossil assemblages, spanning the time interval from about 125 to 77 ka. The assemblages appear to represent MIS 5e, 5c, 5b, and 5a. A total of 99 taxa were identified, mostly beetles. The fossils represent the oldest known Pleistocene insect faunas from high elevation in the Rocky Mountains, and document a series of climatic oscillations from full interglacial to stadial and interstadial environments, accompanied by changes in regional biological communities. The MIS 5e fauna indicates summer temperatures similar to modern values, with winter temperatures 5–7 °C cooler than today. Regional climates cooled somewhat by MIS 5c, and during MIS 5b summer temperatures were 5–6 °C colder than modern values. Summer temperatures recovered to near-modern levels during early MIS 5a, and cooled by 1–2 °C at its end, although winter temperatures were apparently above modern levels. The indication of milder but wetter winters, strengthened by the inclusion of species found today only in the Pacific Northwest region, suggests conditions that may have led to increased snowpack at high elevations in this part of the Rocky Mountains, linked with the onset of MIS 4 glaciation.

Keywords

Late PleistoceneInsect fossilsZiegler ReservoirColorado
Type
Articles
Information
Quaternary Research , Volume 82 , Issue 3 , November 2014 , pp. 592 - 603
Copyright
University of Washington

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