Insects from the Upper Miocene Grubstake Formation of Alaska ; American Museum novitates, no. 3612

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dc.contributor.author Grimaldi, David A. en_US
dc.contributor.author Triplehorn, Don M. en_US
dc.date.accessioned 2008-06-23T15:02:34Z
dc.date.available 2008-06-23T15:02:34Z
dc.date.issued 2008 en_US
dc.identifier.uri http://hdl.handle.net/2246/5920
dc.description 19 p. : ill., map ; 26 cm. en_US
dc.description Includes bibliographical references (p. 17-19). en_US
dc.description.abstract Well-preserved insect wings are reported in weakly consolidated lacustrine shale from the Grubstake Formation, Upper Miocene of Suntrana Creek, central Alaska. 40Ar/39Ar dating of an immediately overlying volcanic ash indicates an age of slightly more than 6.7 Ç 0.1 Ma, or approximately one million years before the opening of the Bering land bridge. The insects include four genera and two subfamilies of ants (Hymenoptera, Formicidae, Myrmicinae and Dolichoderinae), a species of Ichneumonidae (Hymenoptera), three genera and families of flies (Diptera: Chironomidae [genus indet.], Bibionidae [Bibio] and Lonchaeidae [Dasiops]), and the elytra of curculionid and carabid beetles. Extant distributions of the flies and possibly the ichneumonid include northerly latitudes around Suntrana. The ants are attributable to the extant genera Dolichoderus or Tapinoma (Dolichoderinae), Solenopsis or Erebomyrma (Myrmicinae), as well as Veromessor and Novomessor (Myrmicinae), indicating extensive biogeographic contraction to more southern latitudes of North America today. These finds are consistent with evidence from a slightly younger deposit from the uppermost Miocene (5.7 Ma) of the Seward Peninsula, Alaska. Implications are discussed regarding the differential effects of climate change and land bridges on the dispersal of various insect taxa. en_US
dc.format.extent 2898824 bytes
dc.format.mimetype application/pdf
dc.language eng en_US
dc.language.iso en_US
dc.publisher New York, NY : American Museum of Natural History en_US
dc.relation.ispartofseries American Museum novitates, no. 3612 en_US
dc.subject.lcc QL1 .A436 no.3612 2008 en_US
dc.subject.lcsh Insects, Fossil -- Alaska -- Suntrana Creek Region. en_US
dc.subject.lcsh Paleontology -- Miocene -- Alaska -- Suntrana Creek Region. en_US
dc.subject.lcsh Paleontology -- Alaska -- Suntrana Creek Region. en_US
dc.title Insects from the Upper Miocene Grubstake Formation of Alaska ; American Museum novitates, no. 3612 en_US
dc.type text en_US

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  • American Museum Novitates
    Novitates (Latin for "new acquaintances"), published continuously and numbered consecutively since 1921, are short papers that contain descriptions of new forms and reports in zoology, paleontology, and geology. New numbers are published at irregular intervals.

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