Huangnitang () is a village of Zhoutang village (), Tianma Subdistrict (),

Changshan County () is a county under the jurisdiction of the prefecture-level city of Quzhou in the west of Zhejiang Province, People's Republic of China, bordering Jiangxi Province to the southwest. The district's total area is 1099 square kilometers, and its p ...

Quzhou Quzhou is a prefecture-level city in western Zhejiang province, People's Republic of China. Sitting on the upper course of the Qiantang River, it borders Hangzhou to the north, Jinhua to the east, Lishui to the southeast, and the provinces o ...

Zhejiang Province Zhejiang ( or , ; , also romanized as Chekiang) is an eastern, coastal province of the People's Republic of China. Its capital and largest city is Hangzhou, and other notable cities include Ningbo and Wenzhou. Zhejiang is bordered by Jiangs ...

, China. It is the location of the

Global Boundary Stratotype Section and Point A Global Boundary Stratotype Section and Point (GSSP) is an internationally agreed upon reference point on a stratigraphic section which defines the lower boundary of a stage on the geologic time scale. The effort to define GSSPs is conducted b ...

(GSSP), which marks the boundary between the Third and

Darriwilian The Darriwilian is the upper stage of the Middle Ordovician. It is preceded by the Dapingian and succeeded by the Upper Ordovician Sandbian Stage. The lower boundary of the Darriwilian is defined as the first appearance of the graptolite species '' ...

Stages of the Middle

Ordovician The Ordovician ( ) is a geologic period and System (geology), system, the second of six periods of the Paleozoic Era (geology), Era. The Ordovician spans 41.6 million years from the end of the Cambrian Period million years ago (Mya) to the start ...

. The GSSP was ratified by the

International Union of Geological Sciences The International Union of Geological Sciences (IUGS) is an international non-governmental organization devoted to international cooperation in the field of geology. About The IUGS was founded in 1961 and is a Scientific Union member of the Inte ...

in 1997. The boundary is defined as the

first appearance In American comic books and other stories with a long history, first appearance refers to the first issue to feature a fictional character. These issues are often highly valued by collectors due to their rarity and iconic status. Reader intere ...

of the

graptolite Graptolites are a group of colonial animals, members of the subclass Graptolithina within the class Pterobranchia. These filter-feeding Filter feeders are a sub-group of suspension feeding animals that feed by straining suspended matter and ...

''Undulograptus austrodentatus''. The graptolite ''Arienigraptus zhejiangensis'' appears 0.5 m below this boundary. The rock section is

shale Shale is a fine-grained, clastic sedimentary rock formed from mud that is a mix of flakes of clay minerals (hydrous aluminium phyllosilicates, e.g. kaolin, Al2 Si2 O5( OH)4) and tiny fragments (silt-sized particles) of other minerals, especial ...

References

External links

* * Geology of China Villages in China Stratigraphy Quzhou {{paleo-site-stub

See also

References

External links