Abstract
Jurassic, northern Pacific Ocean region
GeoRef, Copyright 2004, American Geological Institute.
G. E. G. Westermann; Doubtful distinction of the Aalenian ammonite genus Tugurites Kalacheva and Sei, 1970. Journal of Paleontology 1972;; 46 (5): 779–780. doi:
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Jurassic, northern Pacific Ocean region