File:M98Ch3Fig4.JPG

Historical (left column) and modern trilobite-based zones within the Upper Cambrian and the Lower Ordovician platform carbonates of Laurentia with references (Refs.) to articles that describe taxonomic and biostratigraphic refinements for intervals delineated by numbered rectangles near the center of the diagram: 1, Rasetti (1965), Westrop (1992); 2, Palmer (1965a), Pratt (1992); 3, Rasetti (1961); 4, Taylor et al. (1999), Loch and Taylor (2004); 5, Longacre (1970); 6, Stitt (1971b); 7, Westrop (1986); 8, Stitt (1983); 9, Adrain et al. (2003); 10, Berg and Ross (1959); 11, Pratt (1988); 12, Boyce (1989); 13, Ross et al. (1997), Dean (1989); 14, Loch (2007); 15, Fortey (1979), Boyce (1989), Brett and Westrop (1996); 16, Hu (1963); 17, Adrain et al. (2009). Tremp. = Trempealeauan Stage.

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.