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Published July 1993 | Published
Journal Article Open

Carbon isotope and magnetic polarity evidence for nondepositional events within the Cambrian-Ordovician Boundary section near Dayangcha, Jilin Province, China


Carbon isotope and magnetic polarity stratigraphic results from the Cambrian-Ordovician Boundary section at Xiaoyangqiao, near Dayangcha, Jilin Province, China, in comparison to a contemporaneous section at Black Mountain, Australia, indicate strata equivalent to major portions of the Australian sequence are either absent or are restricted to highly condensed intervals. These intervals are correlative with regressive sea level events identified in Australia and western North America, suggesting regional or eustatic sea level changes strongly influenced deposition of the Xiaoyangqiao sequence. These results also suggest the Xiaoyangqiao section is unfavourable as the site of the Cambrian-Ordovician Boundary Global Stratotype Section and Point.

Additional Information

© 1993 Cambridge University Press. The authors wish to thank the Organizing Committees for the 1986 meeting of the Cambrian-Ordovician Boundary Working Group in Dayangcha for permission to work in their respective areas, and for their assistance in collecting samples. Laboratory and sampling assistance by A. Kobayashi-Kirschvink and R. Selnikov are gratefully acknowledged. J. L. Miller and two anonymous reviewers contributed helpful comments to improve this paper. This work was supported by SF Grants EAR-8721391 and PYI-8351370, by contributions from the Chevron Oil Field Research Company and the Arco Foundation, and by a Sir Charles Clore postdoctoral fellowship to the senior author. Weizmann Institute of Science Department of Environmental Science and Energy Research contribution 66; CIT Division of Geological and Planetary Sciences contribution 5176.

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