Abstract
A particular kind of sedimentation took place in the western Vosges during the Lettenkohle (late Trias). Following the formation of coastal lagoons, a wide delta spreading from the Germanic basin, deposited fine arenites with marine and fresh-water elements. Within the fluvial beds, some sequences appear which present calcified Lingula phospharenites, under silty argillites containing Estheria (Conchostraca). Superposition of a marine influenced ecosystem, with reduced population, by a fresh-water one, sequentially repeated at the end of a megasequence, indicates that the fluvial environment was going to take progressively the place of the paralic environment.
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