Cambrian Stage 4 is the still unnamed fourth stage of the Cambrian and the upper stage of Cambrian Series 2. It follows Cambrian Stage 3 and lies below the Wuliuan. The lower boundary has not been formally defined by the International Commission... Wikipedia
Occurred: 514 million years ago - 509 million years ago
Epoch: Cambrian Series 2
Lower boundary definition: Not formally defined
Upper boundary definition: FAD of Oryctocephalus indicus
Upper GSSP ratified: 2018