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...merican carbonate bank: The geology and economic resources of the Cambrian–Ordovician Sauk megasequence of Laurentia: AAPG Memoir 98, p. 5–13.

...(2003), Babcock et al. (2005, 2007), and Peng et al. (2004); those for the Ordovician are from Webby et al. (2004) as modified in Bergstrom et al. (2006). Abbrev ...merican carbonate bank: The geology and economic resources of the Cambrian–Ordovician Sauk megasequence of Laurentia: AAPG Memoir 98, p. 15–35.

Geologic column of Ordovician-Devonian rocks in eastern Ohio and western Pennsylvania, Appalachian basin

...sitional settings in the southern margin of the Tethys (below) during Late Ordovician time (about 440 Ma), modified after Cocks and Torsvik (2002). From F. Berra

...wer Ordovician) part of the Sauk megasequence and the Middle and the Upper Ordovician part of the Tippecanoe megasequence and their relationship to modern North ...merican carbonate bank: The geology and economic resources of the Cambrian–Ordovician Sauk megasequence of Laurentia: AAPG Memoir 98, p. 15–35.

Refined biostratigraphic framework for the uppermost Cambrian and lowest Ordovician of Laurentian North America, showing 25 thin biostratigraphically discrimin ...merican carbonate bank: The geology and economic resources of the Cambrian–Ordovician Sauk megasequence of Laurentia: AAPG Memoir 98, p. 15–35.

...) and modern trilobite-based zones within the Upper Cambrian and the Lower Ordovician platform carbonates of Laurentia with references (Refs.) to articles that d ...merican carbonate bank: The geology and economic resources of the Cambrian–Ordovician Sauk megasequence of Laurentia: AAPG Memoir 98, p. 15–35.