GSSP Darriwilian
map of china showing gssp location.
the gssp of darriwilian huangnitang section (28°51′14″n 118°29′23″e / 28.8539°n 118.4897°e / 28.8539; 118.4897) near village huangnitang, 3.5 km southwest of changshan county town (zhejiang, china). outcrop of ningkuo formation, consisting of black shale. lower boundary of darriwilian defined first appearance datum of graptolite species undulograptus austrodentatus in section.
a secondary fossil marker graptolite arienigraptus zhejiangensis.
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