Following examination of the evolution of the Jurassic Andean retroarc basin at a global scale for the Central Andes, this paper analyses the pattern of the regressive process, and discusses some general features concerning Andean Jurassic Paleogeography. The early Upper Jurassic regression obeys to an exactly reverse pattern as the one evidenced for the Lower Jurassic transgressive process. Se...

Stegosaurs are a major clade of ornithischian dinosaurs, yet because their fragmentary fossil record, interrelationships and early evolution poorly understood. Here, we describe new stegosaur, Bashanosaurus primitivus, gen. et sp. nov., some other indeterminate stegosaur materials. We provide U-Pb detrital zircon ages for horizons bounding the holotypic quarry in Lower Member Shaximiao Formatio...

A new interpretation of the Middle Jurassic-Early Cretaceous paleogeographic evolution NW sector Latium-Abruzzi carbonate platform facing Umbria-Marche Basin is proposed, based on Monte Giano area (central Apennines, Italy). During Late Triassic-early Bajocian time, was characterized by shallow water sedimentation. Inner and marginal deposits are overlain pelagic (Posidonia level), early p.p. i...

The present study is a contribution to the lithostratigraphy of Middle Jurassic strata in area Zimevitsa Plateau (West Balkan Mts, West Bulgaria). Based on its lithological and regional properties, Dobravitsa Member distinguished from surrounding rocks Etropole Formation. new member consists alternating shales, siltstones fine-grained sandstones. It also contains abundant siderite calcite concr...

In the southernmost outcrops of Slovenian Basin Middle Jurassic coarse-grained limestone breccia (mega)beds are interstratified within a succession that is otherwise dominated by hemipelagites and distal turbidites. this paper, these beds described as Ponikve Breccia Member Tolmin Formation. We provide descriptions studied sections with detailed geological maps analysis lithoclasts. From latter...