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A Postglacial Coleopterous Assemblage from Lockport Gulf, New York

Published online by Cambridge University Press:  20 January 2017

Randy F. Miller  and
Alan V. Morgan
Randy F. Miller
Affiliation:
Department of Earth Sciences, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
Alan V. Morgan
Affiliation:
Department of Earth Sciences, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
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Abstract

The Lockport Gulf site near Lockport, New York, is a 1.9-m sequence of organic-rich marls having a basal date of approximately 10,920 yr B.P. Six bulk samples with a combined weight of 48 kg produced over 780 individual fossil insects representing five orders, as well as molluscs and abundant plant macrofossils. Coleoptera were represented by 24 families. Several major beetle groups (Carabidae, ground beetles; Hydrophilidae, water scavenger beetles; Elmidae, riffle beetles; Staphylinidae, rove beetles; and Scolytidae, bark beetles) indicate a riffle-and-pool stream, surrounded by marsh, with open riparian habitats and nearby trees. Two zones were recognized based on the Coleoptera assemblages. The Zone 1 fauna (ca. 10,920–9800 yr B.P.) was dominated by boreal forest taxa with abundant bark beetles indicating the presence of spruce trees. In Zone 2 (ca. 9700-9100 yr B.P.) the combination of species with a restricted modern distribution in the Great Lakes-St. Lawrence Forest region and pine and deciduous tree inhabitants suggests a change in vegetation by 9700 yr B.P. Thermal estimates from a faunal analysis indicate that the climatic conditions were stable across the spruce-pine transition, with the mean July temperature in the range of 16° to 18°C.

Type
Research Article
Information
Quaternary Research , Volume 17 , Issue 2 , March 1982 , pp. 258 - 274
Copyright
University of Washington

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