Following the Cambrian Explosion and the appearance in the fossil record of most animal
phyla associated with a range of new body plans, the Ordovician and Silurian periods …

The 'Great Ordovician Biodiversification Event'(GOBE) saw a spectacular increase in marine
biodiversity at all taxonomic levels largely within the phyla established much earlier during …

The ability to resolve the stratigraphic record of Earth history is critical to understanding past
global change events and the range of natural variability within the global paleoclimate. The …

About 500 samples from 11 Ordovician sections in South China have been analysed for
their δ13Ccarb composition. Four sections are located in the Yangtze platform region, the …

High-precision isotope-dilution U-Pb (zircon) dating was conducted on three volcanic ash
fall (bentonite) samples from the Swedish island of Gotland, and on a fourth bentonite from …

Conodonts are tooth-like elements of a primitive chordate and are generally abundant in
many marine sedimentary rocks deposited from the late Cambrian to the latest Triassic. For …

New stable carbon isotope data (δ 13 C carb) from Lower–Middle Ordovician (Tremadocian
to Darriwilian) carbonate mudstone and wackestone rocks of the Pogonip Group are …

The early Silurian Llandovery–Wenlock boundary interval is marked by significant marine
perturbations and biotic turnover, culminating in the Ireviken Extinction Event and the Early …

Procedures used to define an international chronostratigraphic stage boundary and to locate
and ratify a Global Boundary Stratotype Section and Point (GSSP) are outlined. A majority of …

Abstract The Illinois Basin of southwestern Illinois and southeastern Missouri contains one of
the most extensive Silurian records in North America and is a potentially critical area for …