The diversification of animals during the Cambrian Period is one most significant evolutionary events in Earth’s history. However, sequence leading to origin ‘modern’ ecosystems and exact temporal relationship between Ediacaran faunas are uncertain, as identification Ediacaran–Cambrian boundary global correlation through this interval remains problematic. Here we review controversies surroundin...

Abstract We describe, interpret, and establish a stratotype for the Frenchman Mountain Dolostone (FMD), new Cambrian stratigraphic unit that records key global geochemical climate signals is well exposed throughout Grand Canyon central Basin Range, USA. This flat-topped carbonate platform deposit uppermost of Tonto Group, replacing informally named “undifferentiated dolomites.” The two chemostr...