A proposed GSSP for the base of the Middle Ordovician Series: The Huanghuachang section, Yichang, China
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A proposed GSSP for the base of the Middle Ordovician Series : The Huanghuachang section, Yichang, China. / Wang, Xiaofeng; Stouge, Svend; Erdtmann, Bernd D.; Chen, Xiaohong; Li, Zhihong; Wang, Chuanshang; Zeng, Qingluan; Zhou, Zhiqiang; Chen, Huiming.
In: Episodes, Vol. 28, No. 2, 06.2005, p. 105-117.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - A proposed GSSP for the base of the Middle Ordovician Series
T2 - The Huanghuachang section, Yichang, China
AU - Wang, Xiaofeng
AU - Stouge, Svend
AU - Erdtmann, Bernd D.
AU - Chen, Xiaohong
AU - Li, Zhihong
AU - Wang, Chuanshang
AU - Zeng, Qingluan
AU - Zhou, Zhiqiang
AU - Chen, Huiming
PY - 2005/6
Y1 - 2005/6
N2 - The Huanghuachang section near Yichang, southern China meets the requirements of Global Stratotype Section and Point (GSSP) for the base of the Middle Ordovician Series and the yet-to-be-named third stage of the Ordovician System (or lower stage of Middle Ordovician Series). The conodont succession at the section is complete across the Lower to Middle Ordovician series boundary and several excellent phylogenetic lineages of Baltoniodus, Trapezognathus, Periodon, and Microzarkodina are represented. The definition of the base of the Middle Ordovician is proposed to be the first appearance datum (FAD) of Baltoniodus? triangularis in the section. It is followed closely by the FAD of Microzarkodina flabellum, which is taken as a reasonable proxy for the boundary. This level approximates the boundary between the lower and upper intervals of the Azygograptus suecicus graptolite Biozone, and nearly coincides with the base of the Belonechitina henryi chitinozoan Biozone. The proposed GSSP for the base of the international Middle Ordovician Series is located in a roadside exposure at the base of Bed (SHod) 16, 10.57 m above the base of the Dawan Formation in the measured Huanghuachang section near Yichang City, southern China. The same faunal succession is also recorded from the Chenjiahe (formerly Doping) section, 5 km to the north of the Huanghuachang section. The proposed boundary horizon can be recognized and correlated globally with high precision in both relatively shallow-water carbonate facies as well as in deep-water graptolite facies.
AB - The Huanghuachang section near Yichang, southern China meets the requirements of Global Stratotype Section and Point (GSSP) for the base of the Middle Ordovician Series and the yet-to-be-named third stage of the Ordovician System (or lower stage of Middle Ordovician Series). The conodont succession at the section is complete across the Lower to Middle Ordovician series boundary and several excellent phylogenetic lineages of Baltoniodus, Trapezognathus, Periodon, and Microzarkodina are represented. The definition of the base of the Middle Ordovician is proposed to be the first appearance datum (FAD) of Baltoniodus? triangularis in the section. It is followed closely by the FAD of Microzarkodina flabellum, which is taken as a reasonable proxy for the boundary. This level approximates the boundary between the lower and upper intervals of the Azygograptus suecicus graptolite Biozone, and nearly coincides with the base of the Belonechitina henryi chitinozoan Biozone. The proposed GSSP for the base of the international Middle Ordovician Series is located in a roadside exposure at the base of Bed (SHod) 16, 10.57 m above the base of the Dawan Formation in the measured Huanghuachang section near Yichang City, southern China. The same faunal succession is also recorded from the Chenjiahe (formerly Doping) section, 5 km to the north of the Huanghuachang section. The proposed boundary horizon can be recognized and correlated globally with high precision in both relatively shallow-water carbonate facies as well as in deep-water graptolite facies.
UR - http://www.scopus.com/inward/record.url?scp=22744431620&partnerID=8YFLogxK
U2 - 10.18814/epiiugs/2005/v28i2/004
DO - 10.18814/epiiugs/2005/v28i2/004
M3 - Journal article
AN - SCOPUS:22744431620
VL - 28
SP - 105
EP - 117
JO - Episodes
JF - Episodes
SN - 0705-3797
IS - 2
ER -
ID: 361837315