Alessandro Ciampalini, Maurizio Forli
[A Tyrrhenian molluscan fauna from the underground of Livorno]. A fossil molluscan fauna, found some years ago during excavations for building foundations, in the north-east side of Livorno (Tuscany, Northern Italy), is described. The exposed section, named �via Gramsci� after its location in the city, is referred to the Tyrrhenian stage (Upper Pleistocene), based on the well known stratigraphy of the area. In particular, the fossil fauna comes from a richly organogenic, coarse calcarenite bed. Taphonomic and palaeoecologic observations allow the molluscan fauna to be referred to the modern, current-swept SGCF bottoms in the Mediterranean, with a strong skeletal supply from Posidonia meadows. The molluscan fauna is compared with others known from literature, coming from coeval layers in the Livorno underground.
Viene descritta una malacofauna fossile, attribuibile su base stratigrafica al Pleistocene superiore (Tirreniano), reperita in uno sbancamento effettuato in via Gramsci a Livorno. L�associazione malacologica è simile a quella di altri depositi coevi noti per il sottosuolo livornese. L�ambiente deposizionale è riferibile agli attuali fondi mediterranei SGCF, a granulometria grossolana e con correnti di fondo. La malacofauna è prevalentemente costituita da elementi alloctoni provenienti dal posidonieto.
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