Fossil age data and molecular sequences are increasingly combined to establish a
timescale for the Tree of Life. Arthropods, as the most species-rich and morphologically …

The diversification of animals during the Cambrian Period is one of the most significant
evolutionary events in Earth's history. However, the sequence of events leading to the origin …

Dating the tree of life is a core endeavor in evolutionary biology. Rates of evolution are
fundamental to nearly every evolutionary model and process. Rates need dates. There is …

Five overlap** sections from the thick Neoproterozoic to early Cambrian sediments of
western Mongolia were analysed to yield a remarkable carbon-isotope, strontium-isotope …

After taxonomic revision, trace fossils show a similarly explosive diversification in the
Ediacaran–Cambrian transition as metazoan body fossils. In shallow-marine deposits of …

Several concepts pertaining to the dramatic changes that occurred during the Cambrian
have been proposed, namely the Agronomic Revolution (AR), the Cambrian Substrate …

Integrated stratigraphic, sedimentologic, and ichnologic analyses indicate that the Stull
Shale Member (Kanwaka Shale, Shawnee Group) at Waverly (Coffey County, eastern …

Carbon and strontium isotopic data are used to show that the earliest sponge spicule
clusters and associated phosphatic sediments (with Anabarites) from southwestern …

The range of Treptichnus pedum, the index trace fossil for the Treptichnus pedum Zone,
extends some 4 m below the Global Standard Stratotype-section and Point for the base of …

The Zavkhan terrane in western Mongolia preserves thick, fossiliferous, carbonate-rich strata
that span the Ediacaran-Cambrian transition. Measured stratigraphic sections and …