The Cambrian–Ordovician transition of the western Mediterranean region (NW Gondwana)
is characterized by the record of major erosive unconformities with gaps that range from a …

The Ordovician is the last of the Paleozoic Periods (and Systems) to have its lower boundary
formally designated. The International Working Group on the Cambrian-Ordovician …

Southward drifting of the western Gondwanan margin during the Cambrian has been
demonstrated by means of both palaeomagnetic methods and lithological indicators of …

The Upper Ordovician (uppermost Caradoc-Ashgill) section of western Estonia consists of a
series of seven open-shelf carbonate sequences. Depositional facies grade laterally through …

Based on biostratigraphic investigations in the eastern Siljan district, central Sweden, and
combined with earlier studies at Hunneberg, south-central Sweden, it is shown that the early …

Carbon isotope profiles of marine carbonate units within the Cambrian-Ordovician boundary
section at Black Mountain, western Queensland, Australia, reveal cyclical changes in δ13C …

Abstract The 70 Ma Ordovician Period is characterized by extensive epeiric seas,
paleocontinent dispersal, intervals of intense volcanism and black shale deposition, a …

The Mäekalda section presents a c. 12 m thick succession of mainly limestones, dolomites
and siltstones of late Tremadoc to late Llanvirn age, exposed on the eastern outskirts of …

The Scandinavian Alum Shale Formation (Middle Cambrian to Lower Ordovician)
accumulated under generally low oxygen concentrations. Syndepositional changes in the …

The succession of earliest Ordovician planktic graptolites (graptoloids) in 11 key sequences
around the world is reviewed and used to assess their distribution in depth facies, in …