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Elimia tenera : ウィキペディア英語版 | Elimia tenera
''Elimia tenera'', formerly known as ''Goniobasis tenera'', is an extinct species of freshwater snails with an operculum, in the aquatic gastropod mollusk family Pleuroceridae.〔Burch, J. B. (1989). ''North American Freshwater Snails''. Malacological Publications, Hamburg, Michigan, 〕 This species flourished during the Eocene and is now known only from the fossil record. The genus name ''Elimia'' was restored to this species in 1975;〔Hartman, Joseph H. and Roth, Barry (1998) "Late Paleocene and Early Eocene Nonmarine Molluscan Faunal Change in the Bighorn Basin, Northwestern Wyoming and South-Central Montana" pp. 358-359 ''in'' Aubry, Marie-Pierre; Lucas, Spencer G. and Berggren, William A. (Eds.) (1998). ''Late Paleocene-early Eocene climatic and biotic events in the marine and biotic events in the marine and terrestrial records'' Columbia University Press, New York, pp. 323-379, ISBN 0-231-10238-0〕 formerly it was placed in ''Goniobasis''. ==Green River Formation deposits==
Fossilized ''Elimia tenera'' shells occur in a region which is now southern Wyoming, northern Colorado and northeastern Utah. The best preserved ''Elimia tenera'' are from Lake Gosiute which fossils occur in the Fort Laclede Bed of the Laney Member at outcrops in Sweetwater County, in southwestern Wyoming.〔Graham, Kenneth Lee (1996). ''Rockhounding Wyoming''. Falcon, Guilford, Connecticut, ISBN 1-56044-445-2〕
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