Abstract Cornute stylophorans are a minor, although typical, component of Middle–Late Ordovician echinoderm assemblages adapted to soft siliciclastic substrates in high-latitude peri-Gondwanan regions. All previously reported occurrences Darriwilian–Katian cornutes from the Czech Republic, France, Morocco and Spain revised their plate homologies reassessed. The genera Beryllia Juliaecarpus rein...

In the Ennedi Plateau, northeastern Chad, Cambrian(?)–Ordovician to Carboniferous strata represent one of most proximal succession north-facing Gondwana platform. This study presents preliminary results related c. 200 m-thick Lower Sandstones and overlying Bedo Formation, which essentially record Early Middle Ordovician flooding events end-Ordovician glaciation subsequent deglaciation. Sandston...

With the targets of petroleum exploration transferred to deep and ancient strata, abundant oil gas resources have been found in Lower Paleozoic older strata central western China. Due complex evolutionary processes including multiple episodes hydrocarbon accumulation ubiquitously accompanied by secondary alterations, significant uncertainties remain concerning generation time these revealed sou...