File:M98Ch3Fig3.JPG

Historical and modern trilobite-based zones within the Lower and the Middle Cambrian platform carbonates of Laurentia and references (Refs.) to recent articles on taxonomic and biostratigraphic refinement for intervals delineated by numbered rectangles in the right column: 1, Hollingsworth (2005, 2006, 2007); 2, Palmer and Repina (1993); 3, Webster (2003, 2005, 2007); 4, Sundberg and McCollum (2003a, b); 5, McCollum and Sundberg (2007); 6, Sundberg (1994, 2005); 7, Robison (1964, 1976); 8, Rasetti, 1965; Pratt (1992); 9, Stitt (1998); 10, Stitt and Perfetta (2000).

From Taylor, John F., John E. Repetski, James D. Loch, and Stephen A. Leslie, 2012, Biostratigraphy and chronostratigraphy of the Cambrian–Ordovician great American carbonate bank, in J. R. Derby, R. D. Fritz, S. A. Longacre, W. A. Morgan, and C. A. Sternbach, eds., The great American carbonate bank: The geology and economic resources of the Cambrian–Ordovician Sauk megasequence of Laurentia: AAPG Memoir 98, p. 15–35.