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AAPG Bulletin
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AAPG Bulletin; Year: 2021; Issue: October DOI: 10.1306/04232120046
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Figure 3.
Generalized stratigraphic column for the northern Appalachian Basin stratigraphic section discussed in the text. Tectophase (TP), Blountian tectophase (B/TP), and Taconic tectophase (T/TP) from Ettensohn (1985, 2004, 2005, 2008) and Ettensohn and Brett (2002). Dashed arrow in the orogeny column indicates early tectonic events (back to ca. 505 Ma) that can be regarded as Taconic, even though they occurred offshore from the Laurentian margin (e.g., Macdonald et al., 2014, 2017). The Alleghanian orogeny occurred during Carboniferous–Permian times (off the figure). Radiometric age dates for the stratigraphic periods are from Walker et al. (2018). Note that “∼497” refers to the base of the upper Cambrian Potsdam Sandstone (Ss.) (the Cambrian Period extends back to ca. 541 Ma). Also note that Iapetan opening occurred circa 620–550 Ma (e.g., O’Brien and van der Pluijm, 2012; van Staal et al., 2013), during the time represented by the unconformity below the Potsdam Ss. Radiometric age date for the approximate end of Neoacadian is from Jacobi et al. (2018). The lithologic stratigraphic portions of the column are primarily after Smith and Nyahay (2005) and Nyahay et al. (2007). Dol. = Dolostone; Fm. = Formation; Ls. = Limestone; Sh. = Shale; slt. = siltstone; ss = sandstone.
Figure 3. Generalized stratigraphic column for the northern Appalachian Basin stratigraphic section discussed in the text. Tectophase (TP), Blountian tectophase (B/TP), and Taconic tectophase (T/TP) from Ettensohn (1985, 2004, 2005, 2008) and Ettensohn and Brett (2002). Dashed arrow in the orogeny column indicates early tectonic events (back to ca. 505 Ma) that can be regarded as Taconic, even though they occurred offshore from the Laurentian margin (e.g., Macdonald et al., 2014, 2017). The Alleghanian orogeny occurred during Carboniferous–Permian times (off the figure). Radiometric age dates for the stratigraphic periods are from Walker et al. (2018). Note that “∼497” refers to the base of the upper Cambrian Potsdam Sandstone (Ss.) (the Cambrian Period extends back to ca. 541 Ma). Also note that Iapetan opening occurred circa 620–550 Ma (e.g., O’Brien and van der Pluijm, 2012; van Staal et al., 2013), during the time represented by the unconformity below the Potsdam Ss. Radiometric age date for the approximate end of Neoacadian is from Jacobi et al. (2018). The lithologic stratigraphic portions of the column are primarily after Smith and Nyahay (2005) and Nyahay et al. (2007). Dol. = Dolostone; Fm. = Formation; Ls. = Limestone; Sh. = Shale; slt. = siltstone; ss = sandstone.