Abstract
A biostratigraphic scale based on Middle Jurassicostracods it established and integrated into the existing ammonite zoning, complemented by data on nautiloids, brachiopods and echinoids, which provide a preliminary biostratigraphic setting. All the species encountered are described and sketched, but the nomenclature is in many cases left open, to allow further definition of species distribution world-side. The geographic distribution of ostracods suggests the existence of a South Tethys province during the Middle Jurassic, isolated from the North Tethys by an oceanic barrier.
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