The sedimentary series of the Castello-Tesino region in the eastern Venetian Prealps comprise a sequence of marine rocks ranging in age from the Liassic to Miocene. The Liassic gray limestones and the Dogger ooelitic limestones are neritic or subreefal deposits. The Malm and the Cretaceous deposits indicate a deepening of the sea. The Eocene and Oligocene facies are more terrigenous, but in the Lutetian, Priabonian, and Oligocene become littoral. The Miocene marks the transgression of a neritic sea indicated by the accumulation of a slightly discordant molasse sequence. The folds trend in a WSW-ENE direction. The stratigraphy and paleogeography indicate that the region belongs to the Belluno zone between the zone of Friuli to the east and the zone of Trento to the west.
A new species of lower Bajocian gastropod, Neritopsis legrosae, is described. The specimen was found in the Castello Terino region of Italy, 55 km northeast of Trento. The test is nearly planispiral, with a differentiated umbilicus. It has a large last whorl and a large round aperture. The ornamentation consists of eight transverse ribs and five regularly spaced major longitudinal ribs with numerous minor longitudinal ribs in between. Transverse striations cross the longitudinal ribs to form a lattice pattern. This specimen seems to agree with the generalization that the more closely planispiral the test becomes, the more differentiated the umbilicus tends to become. Neritopsis legrosae moderately resembles Neritopsis planispira Gamellaro but has different ornamentation.
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