期刊
GFF
卷 136, 期 1, 页码 208-213出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/11035897.2013.865666
关键词
Cambrian; Stage 10; GSSP; first appearance datum; agnostoid; Lotagnostus americanus
资金
- National Natural Science Foundation of China [41221001, 41290260, 41330101]
The first appearance datum (FAD) of the cosmopolitan agnostoid trilobite Lotagnostus americanus is a widely used marker for defining the base of the uppermost stage of the Cambrian System. Detailed field study on the L. americanus-bearing interval of the Wa'ergang section, Hunan, China, reveals the FAD of L. americanus to be 29.65m above the base of the Shengjiawan Formation. This horizon is close to the lowest known occurrences of the intercontinentally distributed polymerid trilobites Hedinaspis regalis and Charchaqia norini. The section has strong potential as a candidate for defining a global standard stratotype-section and point marking the base of provisional Stage 10.
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