Guzhangian [SEP] named after
Guzhangian
The Guzhangian is an uppermost stage of the Miaolingian Series of the Cambrian. It follows the Drumian Stage and precedes the Paibian Stage of the Furongian Series. The base is defined as the first appearance of the trilobite "Lejopyge laevigata" around million years ago. The Guzhangian-Paibian boundary is marked by the first appearance of the trilobite "Glyptagnostus reticulatus" around million years ago.
The name Guzhangian is derived from Guzhang County in Hunan Province of China.
The GSSP is defined in the Huaqiao Formation in Hunan
Drumian
The Drumian is a stage of the Miaolingian Series of the Cambrian. It succeeds the Wuliuan and precedes the Guzhangian. The base is defined as the first appearance of the trilobite "Ptychagnostus atavus" around million years ago. The top is defined as the first appearance of another trilobite "Lejopyge laevigata" around million years ago.
The GSSP is defined in the "Drumian section" () in the Drum Mountains, Millard County, Utah, United States. The stage was also named after the Drum Mountains.