Asian freshwater mollusks from Pleistocene deposits in the Old Crow Basin, Yukon Territory

Approximately 15 species of terrestrial and freshwater mollusks are reported from Pleistocene deposits in the unglaciated Old Crow Basin of the northern Yukon Territory. Of those species, Bulimus leachi (Sheppard), a widespread Eurasian species; and Valvata piligera yukonensis (n. ssp.), closely rel...

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Bibliographic Details
Published in:Canadian Journal of Earth Sciences
Main Authors: Clarke, Arthur H., Harington, C. R.
Format: Article in Journal/Newspaper
Language:English
Published: Canadian Science Publishing 1978
Subjects:
General Earth and Planetary Sciences
Yukon
Sheppard
Old Crow
Online Access:http://dx.doi.org/10.1139/e78-004
http://www.nrcresearchpress.com/doi/pdf/10.1139/e78-004
Description
Summary:Approximately 15 species of terrestrial and freshwater mollusks are reported from Pleistocene deposits in the unglaciated Old Crow Basin of the northern Yukon Territory. Of those species, Bulimus leachi (Sheppard), a widespread Eurasian species; and Valvata piligera yukonensis (n. ssp.), closely related to an unusual Valvata now confined to Lake Baikal, U.S.S.R., are recorded from North America for the first time. Possible causes for the failure of these species of freshwater mollusks to become established in North America are considered.

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