Wuliuan

The Wuliuan stage is the fifth stage of the Cambrian, and the first stage of the Miaolingian Series of the Cambrian. It was formally defined by the International Commission on Stratigraphy in 2018. Its base is defined by the first appearance of the trilobite species Oryctocephalus indicus; it ends with the beginning of the Drumian Stage, marked by the first appearance of the trilobite Ptychagnostus atavus around 504.5 million years ago.

Wuliuan
Chronology
Etymology
Name formalityFormal
Name ratified2018
Former name(s)Cambrian Stage 5
Usage information
Celestial bodyEarth
Regional usageGlobal (ICS)
Time scale(s) usedICS Time Scale
Definition
Chronological unitAge
Stratigraphic unitStage
First proposed byZhao et al., 2018
Time span formalityFormal
Lower boundary definitionFAD of Oryctocephalus indicus.
Lower boundary GSSPWuliu-Zengjiayan, Guizhou, China
26.0807°N 108.4138°E / 26.0807; 108.4138
Lower GSSP ratified2018
Upper boundary definitionFAD of the Trilobite Ptychagnostus atavus
Upper boundary GSSPDrumian section, Wheeler Shale, Utah, U.S.A.
39.5117°N 112.9915°W / 39.5117; -112.9915
Upper GSSP ratified2006

The 'golden spike' that formally defines the base of the period is driven into the Wuliu-Zengjiayan(乌溜-曾家崖)section of the Kaili formation, near Balang Village in the Miaoling Mountains, Guizhou, China.

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