Midwestern USA USA
Geological Time: Jurassic Middle Jurassic Callovian
classification and image courtesy of
holotype
The identification is based upon:
, : Loeblich, A. R.; Tappan, H. (1950). North American Jurassic Foraminifera, II. Characteristic western interior Callovian species. Journal of the Washington Academy of Sciences. 40: 5-19. Plate , Fig.
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