The Upper Ordovician Trenton Group of New York State is one of a number of Appalachian limestones which yields paleomagnetic poles suggesting disturbance in the late Paleozoic. Calcite fractions dissolved from samples of a 238U 206pb a e of 454+8 Ma the Trenton Limestone define g (MSWD = 12.8) in excellent agreement with 40Ar-39Ar and U-Pb ages for the deposition of the underlying Diecke Benton...

Variations in continental volcanic arc emissions have the potential to control atmospheric carbon dioxide (CO2) levels and climate change on multimillion-year time scales. Here we present a compilation of ~120,000 detrital zircon uranium-lead (U-Pb) ages from global sedimentary deposits as a proxy to track the spatial distribution of continental magmatic arc systems from the Cryogenian period t...

The İstanbul-Zonguldak Tectonic Unit is regarded as the easternmost fragment of Avalonia-Carolina and stands for Far East Avalonia. Its stratigraphy also characterized by discontinuous sedimentation from Late Ediacaran to Carboniferous. In western part block, known İstanbul Terrane, Gözdağ Formation represented lagoonal sedimentary rocks consisting shale-sandstone with limestone Middle Ordovici...

This study reviews the available data on Phanerozoic plume activity (Large Igneous Provinces (LIP’s) size and frequency) geochemistry of their igneous rocks. A major goal this review is to try find changes in intensity mantle plumes linked Earth’s evolution galactic seasonality that was supposed authors’ previous publications. The indicate Cambrian–Ordovician Jurassic–Cretaceous summers were as...

A Silurian regional tectonometamorphic event has been widely recorded by different geochronological methods in the Sierras Pampeanas, NW Argentina and Precordillera. It took place between ca. 445 420 Ma after Hirnantian (late Ordovician) glaciogenic sedimentation. Three domains are recognized. 1) The eastern Pampeanas Puna mainly record focused westward ductile thrusting heating. 2) In westernm...

Ireland is well known to geologists as containing some of the thickest successions of Early Ordovician (485!470 Ma; Walker et al. 2012) sedimentary rocks in the world. The carbon stable isotope compositions (dC value) of similarly aged rocks have been reported for only very few places in the world (i.e., Argentina, southern China, and southern France), and no such analyses have been performed o...

Phylogenetic studies are rare in early Palaeozoic cephalopods. Here, we present the first cladistic analysis of order Lituitida based on published, as well some new, material. Three clades recovered within ingroup lituitids, Sinoceras, Ancistroceras and Lituites; former two groups correspond to family Sinoceratidae, latter one Lituitidae. The topology shows that Sinoceratidae represents basal b...