Pyroclastic material in the form of altered volcanic ash or tephra has been reported and
described from one or more stratigraphic units from the Proterozoic to the Tertiary. This …

The timing and causes of the transition to an icehouse climate in the Late Ordovician are
controversial. Results of an integrated δ13C and sequence stratigraphic analysis in Nevada …

Abstract The Upper Ordovician Cincinnatian Series is a critical upper Katian reference
succession. Previously, six 3rd-order depositional sequences (C1 to C6) have been …

Carbonate platforms changed substantially in spatial extent, geometry, composition and
palaeogeographical distribution through the Phanerozoic. Although reef construction and …

Temporal patterns of origination and extinction are essential components of many
paleontological studies, but it has been difficult to obtain accurate rate estimates because …

Abstract Late Middle to Late Ordovician subtidal ramp carbonates of New Mexico, Texas,
and Oklahoma contain abundant spiculitic chert (to 70% chert by volume) and phosphate (1 …

Oxygen isotopes measured on Late Ordovician conodonts from Minnesota and Kentucky
(United States) were studied to reconstruct the paleotemperature history during late …

Recent studies have emphasized that faunal change is typically brief and most commonly
occurs at sequence boundaries and major flooding surfaces. The Upper Ordovician of the …

δ13C values of numerous limestone samples from Katian (Upper Ordovician) successions in
Oklahoma and the Upper Mississippi Valley document the presence of at least three of the …

Aim To investigate relative niche stability in species responses to various types of
environmental pressure (biotic and abiotic) on geological time‐scales using the fossil …