The Paleobiology Database

Knoll et al. Proterozoic Periods of Harland

Interval	Maximum correlate	Ma

Vendian	Ediacaran
time term is invalid and synonymous with Ediacaran
		635

Marinoan	Cryogenian
Marinoan was not recognized by Harland et al.; Sturtian and Marinoan are separated by an interglacial of uncertain duration
		663

Sturtian	Cryogenian
age of base in a minimum
		723

Authorizer: J. Alroy Enterer: J. Alroy

Continent: global Rank of each interval: period/system

Basis of scale: paleontological