Foraminifera source details
Eicher, D. L.; Worstell, P. (1970). Lunatriella, a Cretaceous heterohelicid foraminifer from the western interior of the United States. Micropaleontology. 16(1): 117-121.
Eicher, D. L.; Worstell, P.
Lunatriella, a Cretaceous heterohelicid foraminifer from the western interior of the United States
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Lunatriella spinifera, n. gen., n. sp., a small heterohelicid foraminifer of inferred planktonic habit, is characterized by irregularly uniserial late chambers which commonly bear single spinelike projections, and by distinctive troughlike flanges extending below the aperture. An associated small species referred with some reservation to Heterohelix pulchra (Brotzen) is believed to be its immediate ancestor. L. spinifera occurs in strata of early Turonian age belonging to the upper part of the Greenhorn Formation and the lower part of the Carlile Shale. It is represented by about 200 specimens from six localities in South Dakota, Kansas and Colorado.