What is "furongian"

The '''Furongian ''' is the fourth and final series of the Cambrian. It lasted from to million years ago. It succeeds the still unnamed 3rd series of the Cambrian and precedes the Lower Ordovician Tremadocian stage. It is subdivided into three stages: the Paibian, Jiangshanian and the unnamed 10th stage of the Cambrian.