Articles 8585 by Loren E. Babcock1, Richard A. Robison2, Margaret N. Rees3, Shanchi Peng4, and Matthew R. Saltzman1 The Global boundary Stratotype Section and Point (GSSP) of the Drumian Stage (Cambrian) in the Drum Mountains, Utah, USA 1 School of Earth Sciences, The Ohio State University, 125 South Oval Mall, Columbus, OH 43210, USA. Email:
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[email protected] 4 State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, 39 East Beijing Road, Nanjing 210008, China. Email:
[email protected] The Global boundary Stratotype Section and Point correlated with precision through all major Cambrian regions. (GSSP) for the base of the Drumian Stage (Cambrian Among the methods that should be considered in the selection of a GSSP (Remane et al., 1996), biostratigraphic, chemostratigraphic, Series 3) is defined at the base of a limestone (cal- paleogeographic, facies-relationship, and sequence-stratigraphic cisiltite) layer 62 m above the base of the Wheeler For- information is available (e.g., Randolph, 1973; White, 1973; McGee, mation in the Stratotype Ridge section, Drum Moun- 1978; Dommer, 1980; Grannis, 1982; Robison, 1982, 1999; Rowell et al. 1982; Rees 1986; Langenburg et al., 2002a, 2002b; Babcock et tains, Utah, USA. The GSSP level contains the lowest al., 2004; Zhu et al., 2006); that information is summarized here. occurrence of the cosmopolitan agnostoid trilobite Pty- Voting members of the International Subcommission on Cam- chagnostus atavus (base of the P.