Abstract This study provides an overview and discussion of controls on the distribution organic reefs during Early Ordovican Period, in Yangtze Platform, a region epicontinental sedimentary rocks South China. The Platform was located low latitudes Ordovician recorded rich diverse through that time. During late Tremadocian Epoch, dolomitic stratiform stromatolites were common supratidal to inter...

Abstract The Ordovician of North and West Africa comprises three main transgressive–regressive sequences understood as ‘second-order’ cycles 10–15 myr duration. Tide- to wave-dominated shallow-marine clastic successions, preserving incidental bryozoan carbonates the north, include fluvial deposits over most proximal southern stretches platform. boundary with Cambrian strata remains unclear but ...

Abstract The Arenig Fawr area of North Wales constitutes the type for British Lower to Middle Ordovician Series and is complemented by sections in Carmarthen Whitland areas South Wales. We describe chitinozoan assemblages from both order aid correlation its region with global series stages. Chitinozoans recorded provide permissive rather than conclusive evidence but suggest that Henllan Ash Mem...

Among the oldest fossil crustaceans are those of the Late Cambrian (Furongian 499 ± 0.3-488.3 ± 1.7 Ma) of Västergötland, central Sweden and the lower Ordovician (Tremadocian 488.3 and 478.6 Ma) of the island of Őland. These are three-dimensionally preserved in nodules from the so called 'stinkstone' ('Orsten') limestone. 'Orsten'-like fossils represent tiny, often meiobenthic organsisms (Haug,...

By comparison with the relatively diverse Early Ordovician cephalopod faunas that lived in association with the low latitude carbonate platforms (e.g. Laurentia [Flower 1964]; Siberia [Balashov 1961]; China [Chen 1976]), those of the high latitude margins of Gondwana are of relatively low diversity, generally poorly known, and where known, often in need of revision. Of those high latitudinal as...

Abstract Amalgamation of the Yangtze and Cathaysia blocks in context Gondwana assembly early Paleozoic has been addressed for decades, but far-field effects on Block during amalgamation remain unclear. In this study, we outline sequence stratigraphic framework Ordovician succession central-upper analyze provenance records sandstone compositions, distributions, detritus zircon U-Pb dating. The i...