… Thirty-seven new radioisotope dates are used in the scaling of the new Ordovician time
scale. The base of the Ordovician Period is defined at the level of the first appearance of the …

… the radiometric evidence for the Ordovician period it is desirable to discuss the boundaries
of the … British opinion on the location of the base of the Ordovician concerns the affiliations of …

… that possibly resulted in the greatest diversity fluctuations of the Ordovician Period. Notably,
palaeocontinents were characterized by high speciation levels at both the genus and family …

… The 70 Ma Ordovician Period is characterized by extensive epeiric seas, paleocontinent …
changes to the biota including the changeover from the Cambrian Fauna to the Paleozoic Fauna…

… of meteorite that was common in the flux in the Ordovician. The data in this study support
that this was the case. For Österplana 065, we know that the chrome-spinel content was rather …

… It is based principally on the global compilation of … The papers providing the source of the
information from this volume, together with a summary of the main areas with tillites and the …

… , but the position of the boundary remains unchanged. The base of the Ordovician took a little
… Point in western Newfoundland and correlated on the basis of a conodont species. During …

… yet been certainly identified in the Upper Cambrian. Recent discoveries … Ordovician bivalve
faunas and their explosive radiation from the Early Ordovician apparently coincides with the …

… global biogeochemical changes in the Late Ordovician. These environmental changes are
… 25 that defines the end of the Ordovician Period. Thus, the evolution of the first land plants …

The Ordovician Period was approximately 80 my in duration, the longest of any Paleozoic
period … The Ordovician witnessed not only the beginnings of rugose and tabulate corals, but …