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| Insects from the Upper Miocene Grubstake Formation of Alaska ; American Museum novitates, no. 3612 |
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| Title: | Insects from the Upper Miocene Grubstake Formation of Alaska ; American Museum novitates, no. 3612 |
| Authors: | Grimaldi, David A. Triplehorn, Don M. |
| Issue Date: | 2008 |
| Publisher: | New York, NY : American Museum of Natural History |
| Series/Report no.: | American Museum novitates, no. 3612 |
| 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 biogeog... |
| Description: | 19 p. : ill., map ; 26 cm. Includes bibliographical references (p. 17-19). |
| URI: | http://hdl.handle.net/2246/5920 |
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