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

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dc.contributor.advisor
dc.contributor.authorGrimaldi, David A.en_US
dc.contributor.authorTriplehorn, D. M.en_US
dc.date.accessioned2008-06-23T15:02:34Z
dc.date.available2008-06-23T15:02:34Z
dc.date.issued2008en_US
dc.description19 p. : ill., map ; 26 cm.en_US
dc.descriptionIncludes bibliographical references (p. 17-19).en_US
dc.description.abstractWell-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 ± 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.extent2898824 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/2246/5920
dc.languageengen_US
dc.language.isoen_US
dc.publisherNew York, NY : American Museum of Natural Historyen_US
dc.relation.ispartofseriesAmerican Museum novitates, no. 3612en_US
dc.subject.lccQL1 .A436 no.3612 2008en_US
dc.subject.lcshInsects, Fossil -- Alaska -- Suntrana Creek Region.en_US
dc.subject.lcshPaleontology -- Miocene -- Alaska -- Suntrana Creek Region.en_US
dc.subject.lcshPaleontology -- Alaska -- Suntrana Creek Region.en_US
dc.subject.lcshPaleoentomology.
dc.titleInsects from the Upper Miocene Grubstake Formation of Alaska ; American Museum novitates, no. 3612en_US
dc.typetexten_US

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