. Bulletin. Natural history; Natuurlijke historie. 116 PEABODY MUSEUM BULLETIN 44. Fig. 6\. Generalized world paleogeographic reconstruction for Middle Triassic time (Anisian- Ladinian) and known distribution of 'nothosaurs' (including Lower and Upper Triassic occurrences). Modified from Smith and Briden (1977). of the Pacific province, 'nothosaurs' have been discovered in Japan (Yabe and Shikama 1948; Mazin 1986) [and possibly Hasegawa and Ota (1975), although the described tooth is impossible to assign to any genus] and with increasing frequency in the Hupeh, Kwangsi, Yunnan, Szechuan, and e
. Bulletin. Natural history; Natuurlijke historie. 116 PEABODY MUSEUM BULLETIN 44. Fig. 6\. Generalized world paleogeographic reconstruction for Middle Triassic time (Anisian- Ladinian) and known distribution of 'nothosaurs' (including Lower and Upper Triassic occurrences). Modified from Smith and Briden (1977). of the Pacific province, 'nothosaurs' have been discovered in Japan (Yabe and Shikama 1948; Mazin 1986) [and possibly Hasegawa and Ota (1975), although the described tooth is impossible to assign to any genus] and with increasing frequency in the Hupeh, Kwangsi, Yunnan, Szechuan, and especially Kweichou (Keichow) provinces of China (Dong 1979; Young 1958, 1959, 1960, 1965a and b, 1972, 1978; Zhen et al. 1985). The Triassic marine deposits of China are very widespread and yield an interesting and diverse vertebrate fauna. Future work in this area will greatly add to our knowledge of the plesiomorphic sauropterygians and may clarify the relationships of the group. Corosaurus, in being restricted to western North America, is situated well outside of the generally accepted Tethyan province. It may be considered to form part of an eastern Pacific faunal province, although its apparently unique paleohabitat (Chapter 6) evidently set it apart from typical Pacific faunas. The extensive Middle to Upper Triassic marine deposits of Nevada, California, Oregon, and Idaho have not yet yielded sauropterygian remains although numerous other vertebrates, particularly ichthyosaurs and thalattosaurs, are known, most notably from the Hosselkus Limestone of California and Luning Formation of Nevada (Merriam 1895, 1902, 1904, 1908; Camp 1976, 1980). As Case (1936) has observed, one such ichthyosaur was originally referred to ''NothosaurusT' by Smith (1894) and reassigned to Shastasaurus by Merriam (1902). [Purranisaurus from the Jurassic of Argentina was described initially as a plesiosaur (Rusconi 1948a, b) and then assigned to the Nothosauridae (Rusconi 1956), but is actually a
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