Controversy over the oxygen isotope composition of seawater began in the 1950's, since
which time there has been no agreement over whether the oxygen isotope composition of …

Biological hard tissues are a rich source of design concepts for the generation of advanced
materials. They represent the most important library of information on the evolution of life …

We present detailed isotope stratigraphies for Carboniferous time based on brachiopod
shell calcite from the midcontinent region of North America. Evidence for shell calcite …

Combined trace element and isotope studies of 319 brachiopods, covering the Ordovician to
Permian time span, show that δ 13 C and δ 18 O in well preserved specimens varied during …

Brachiopods, trilobites, cements and whole rock (= matrix) material were evaluated for their
reliability as proxies of original seawater carbon, oxygen and strontium isotope chemistry. In …

Abstract The Lower Ordovician Upper Knox Group is characterized by shallowing-upward
peritidal cycles that are extensively dolomitized to form massive dolomite. Most (85%) …

The end of the Permian was a time of crisis that culminated in the Earth's greatest mass
extinction. There is much speculation as to the cause for this catastrophe. Here we provide a …

Abstract Carbonate Associated Sulfate (CAS) is trace sulfate incorporated into carbonate
minerals during their precipitation. Its sulfur isotopic composition is often assumed to track …

This study investigates δ13C and δ18O variations in the shells of modern brachiopods
representing all extant groups of calcite-precipitating brachiopods, collected live from 8 …

Cretaceous rudists, with thick, multilayered, bimineralic (aragonite and low-Mg calcite)
shells, have been studied for the effects of meteoric diagenesis on their textural and …