Despite their importance for understanding phylogeny, character evolution and
classification, well‐constrained homology relationships for posterior plating in crinoids have …

Selectivity of mass extinctions is thought to play a major role in coupling or decoupling of
taxonomic, morphological, and ecological diversity, yet these measures have never been …

Abstract Middle to Upper Ordovician ironstone and associated sedimentary rocks of the
West Asturian‐Leonese and Cantabrian tectonostratigraphic zones, Spain, provide new …

The extensive, predominantly siliciclastic deposits of the Upper Ordovician of the Tafilalt
have long been the subject of scientific investigation. In the past 25 years, intensified …

This study documents previously unknown taxonomic and morphological diversity among
early Palaeozoic crinoids. Based on highly complete, well preserved crown material, we …

Abstract The Anti-Atlas contains a thick, volcanic-free Ordovician succession that originally
deposited in a passive-margin basin. Three main sedimentary packages are bounded by …

This study presents a Cambrian–Ordovician (Cambrian,'Series 3'–Katian, Ka4) brachiopod α-
diversity curve for the Iberian terrane. Three diversity pulses characterized the northern …

Supercontinents are usually interpreted to be single and rigid continental plates. How and
when Pangea became a rigid supercontinent is disputed, and age estimations vary from …

A new upper Katian (Kralodvorian Regional Stage) benthic association from the Riba de
Cima Member of the Ferradosa Formation, Portugal, is described. It is dominated by …

The Upper Ordovician (lower Katian) Bobcaygeon and Verulam formations from the Lake
Simcoe region of Ontario contain a highly diverse echinoderm assemblage that is herein …