FAUNAL ASSEMBLAGES AND DISTRIBUTIONAL SHIFTS OF COLEOPTERA DURING THE LATE PLEISTOCENE IN CANADA AND THE NORTHERN UNITED STATES

1980 ◽  
Vol 112 (11) ◽  
pp. 1105-1128 ◽  
Author(s):  
Alan V. Morgan ◽  
Anne Morgan
Keyword(s):  
United States ◽  
Laurentide Ice Sheet ◽  
Last Interglacial ◽  
Faunal Assemblages ◽  
Fossil Insect ◽  
Northern United States ◽  
Late Wisconsinan ◽  
Faunal List ◽  
Distributional Shifts ◽  
Northwestern North America

AbstractA faunal list of 362 sub-fossil Coleoptera obtained from 33 published and 24 unpublished sites of Pleistocene age in Canada and the neighbouring United States is given. A table indicates the distribution of families, with the number of species encountered, through discrete intervals of Pleistocene time. Seven species representing members of the Carabidae, Hydrophilidae, Staphylinidae, and Scolytidae have been used to illustrate distribution changes through the last interglacial/glacial/present interglacial cycle. The maximum distance so far recorded is a shift of over 9000 km for Anotylus gibbulus (Epp.), a staphylinid, found fossil in Toronto during the last interglacial, and today recorded only from Eurasia and Asia. A number of other species whose modern ranges are confined to northwestern North America have been found fossil in the Great Lakes – St. Lawrence region, over 4000 km distant. A similar shift is noted in species which today are found only in the eastern Canadian Arctic. Aspects of ice build up, marginal conditions outside the Laurentide Ice Sheet limits, Pleistocene climates, paleoecology, and sub-fossil insect localities are used to formulate hypotheses about three refugia around the perimeter of the Late Wisconsinan ice.

scholarly journals The Early Wisconsinan History of the Laurentide Ice Sheet

2008 ◽  
Vol 41 (2) ◽  
pp. 199-213 ◽  
Author(s):  
Jean-Serge Vincent ◽  
Victor K. Prest
Keyword(s):  
United States ◽  
Ice Sheet ◽  
Sensu Stricto ◽  
Laurentide Ice Sheet ◽  
Stage 4 ◽  
History Of ◽  
Northern United States ◽  
Late Wisconsinan ◽  
Available Information ◽  
Ice Complex

ABSTRACT The identification, particularly at the periphery of the ice sheet, of glacigenic sediments thought to postdate nonglacial sediments or paleosols regarded as having been laid down sometime during the Sangamonian Interglaciation (stage 5) and thought to predate nonglacial sediments or soils reckoned to be of Middle Wisconsinan age (stage 3), has led numerous authors to propose that the Laurentide Ice Sheet initially grew during the Sangamonian and/or the Early Wisconsinan (stage 4). The evidence for the beginning of the Wisconsinan ice sheet in various areas of Canada and the northern United States is briefly reviewed. The general absence of sound geochronometric frameworks for potential Sangamonian or Early Wisconsinan glacial deposits has led to a situation where in most areas it can be argued, depending on one's interpretation, that ice completely inundated or was completely absent at that time. On the premise (perhaps false) that Laurentide Ice was in fact extensive during the Early Wisconsinan, a map showing maximum possible ice extent, as put forward by some authors is presented and the glacigenic units possibly recording the ice advance are shown in a correlation chart. This post Sangamonian sensu stricto (substage 5e) -pre Middle Wisconsinan limit of ice extent is generally more extensive than the Late Wisconsinan (stage 2) limit. The geometry of the ice sheet margin and scanty available information on direction of ice movements indicate that this assumed Early Wisconsinan ice likely developed in a very similar manner to that of the Late Wisconsinan ice complex. A hypothetical growth model of the Laurentide Ice Sheet, following the last interglaciation is also proposed.

Late Pleistocene zoogeographic shifts and new collecting records for Helophorus arcticus Brown (Coleoptera: Hydrophilidae) in North America

1989 ◽  
Vol 67 (5) ◽  
pp. 1171-1179 ◽  
Author(s):  
Alan V. Morgan
Keyword(s):  
United States ◽  
North America ◽  
Late Pleistocene ◽  
First Record ◽  
Eastern Canada ◽  
Northern United States ◽  
Late Wisconsinan ◽  
Climatic Records

Helophorus arcticus Brown is a rare hydrophilid beetle, previously known from localities in subarctic and eastern Canada. New sites, including the first record for the province of Quebec, are described with the modern habitats, and climatic records are provided for the known range of the species. Fossil specimens of H. arcticus are known from both early and late Wisconsinan sites in southern Canada and the northern United States. The movement of the species is hypothesized from the last (Sangamonian) Interglacial to the present together with potential new collecting areas in subarctic North America.

The North American Species in Group VII of Ips De Geer (Coleoptera: Scolytidae)

1965 ◽  
Vol 97 (2) ◽  
pp. 193-198 ◽  
Author(s):  
G. R. Hopping
Keyword(s):  
United States ◽  
New Species ◽  
North American ◽  
North American Species ◽  
The North ◽  
Northern United States

AbstractGroup VII of North American Ips contains I. thomasi, new species, I. borealis Swaine and I. swainei R. Hopping. They are less than 4.0 mm. long and females have the front of the head or at least the vertex smooth and shining, impunctate, or with very fine sparse punctures; males are more coarsely granulate-punctate on the frons. The species are described and a key is given. All breed in Picea in Canada and northern United States.

Absence of Glaciation in Illinois during Marine Isotope Stages 3 through 5

1996 ◽  
Vol 46 (1) ◽  
pp. 19-26 ◽  
Author(s):  
B. Brandon Curry ◽  
Milan J. Pavich
Keyword(s):  
Oxygen Isotope ◽  
Late Stage ◽  
Lake Michigan ◽  
Early Stage ◽  
Ice Sheet ◽  
Laurentide Ice Sheet ◽  
Argillic Horizon ◽  
Late Wisconsinan ◽  
Lake Michigan Lobe

A10Be inventory and14C ages of material from a core from northernmost Illinois support previous interpretations that this area was ice free from ca. 155,000 to 25,000 yr ago. During much of this period, from about 155,000 to 55,000 yr ago, 10Be accumulated in the argillic horizon of the Sangamon Geosol. Wisconsinan loess, containing inherited 10Be, was deposited above the Sangamon Geosol from ca. 55,000 to 25,000 yr ago and was subsequently buried by late Wisconsinan till deposited by the Lake Michigan Lobe of the Laurentide Ice Sheet. The Sangamonian interglacial stage has been correlated narrowly to marine oxygen isotope substage 5e; our data indicate instead that the Sangamon Geosol developed during late stage 6, all of stages 5 and 4, and early stage 3.

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