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Reference
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| Title: |
The Mesozoic Pelecypods Otapiria Marwick and Lupherella Imlay, New Genus, in the United States
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1967
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Abstract: The pelecypod genera Otapiria Marwick and Lupherella Imlay, n. gen., both resembling the late Triassic genus Monotis, are recorded for the first time from Mesozoic beds in the United States. Lupherella is represented by L. bocchiformis (Hyatt) from beds of Pliensbachian age in eastern Oregon and California. It has not been found elsewhere. One species of Otapiria, named O. tailleuri Imlay, n. sp., has been found in northern Alaska associated with or directly underlying Inoceramus cf. I. lucifer Eichwald, whose presence indicates an early Middle Jurassic or late Early Jurassic age not older than Toarcian. Another species, referred to as O. sp. undet., has been found as float in the upper Yukon Valley in east-central Alaska. Its age is unknown, but the presence of the crinoid Pentacrinus subangularis var. alaska Springer in the same float indicates that beds of Early Jurassic age are present in the area. Otapiria has been found previously in Upper Triassic to Upper Jurassic beds in New Zealand, Lower Jurassic beds in New Caledonia, and Upper Triassic to Lower Jurassic beds in northeastern Siberia. |
| Report by: |
Ralph W. Imlay
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| | Age: | Toarcian-Bajocian (Toarcian - early Bajocian) |
| Formation: | Unnamed (Unnamed organic shale) |
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| Comment: | An age not younger than early middle Bajocian is shown by the close resemblance of some of the Inoceramus (USGS Mesozoic locs. 24060 and M2451) to Inoceramus cf. I. lucifer Eichwald, which in southern Alaska occurs only in the lower part of a sequence of Bajocian age (Imlay, 1955, p. 86: 1964, p. B18) (from Imlay, 1967, p. B6) |
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