Katian (Upper Ordovician) δ13C chemostratigraphy and sequence stratigraphy in the United States and Baltoscandia: A regional comparison

Sea-level curve for the Middle to early Late Ordovician in the Armorican Massif (western France): Icehouse third-order glacio-eustatic cycles

“…50 m; Loi et al, 2010), may easily reach a more general agreement. This glacial event is most likely coeval with the Frognerkilen Event in Baltoscandia (Nielsen, 2011) and the GICE event (Guttenberg excursion; Saltzman and Young, 2005;Kaljo et al, 2007;Bergström et al, 2010;Ainsaar et al, 2010;Elrick et al, 2013). In both cases however, only the worldwide synchronicity of these events could demonstrate that they reflect the development of polar ice sheets, the extents of which currently are poorly constrained.…”

“…Among the multiple inferred glacio-eustatic cycles, one of them is thought to reflect a significant glacial event in the upper -but not uppermostDarriwilian (Kerarvail Mb). It would correspond to the "MidDarriwilian" event(s) described in the literature (Rasmussen et al, 2009;Ainsaar et al, 2010;Bergström et al, 2010;Turner et al, 2012). In Baltoscandia in particular, Nielsen (2004Nielsen ( , 2011) recognizes several prominent sea-level falls during the Darriwilian (i.e.…”

RNames, a stratigraphical database designed for the statistical analysis of fossil occurrences – the Ordovician diversification as a case study

“…The relative position of these beds to the stage boundary is not fully resolved and as a consequence during the last several years the boundary interval has been intensively discussed (e.g., Young et al, 2005;Ainsaar et al, 2010;Bergström et al, 2010;Bergström et al, 2011;Chen et al, 2013;Pouille et al, 2013;Carlucci et al, 2015;Sell et al, 2015;Taylor and Loch, 2015;Bergström et al, 2016;Kröger et al, 2016;Quinton et al, 2016).…”

Faunal epiboles in the Upper Ordovician of north-central Kentucky: Implications for high-resolution sequence and event stratigraphy and recognition of a major unconformity

“…2), where the units described above appear to grade laterally, in ascending order, respectively, into: (1) a basal grainstone-packstone interval (locally termed the lower Marble Hill bed); (2) a sparsely fossiliferous mudstone and cherty calcisiltite; (3) the Fisherville coral bed; and (4) a soft Cyphotrypa bryozoan-bearing shale (Butts, 1915); the Clarksville interval, however, appears to be largely absent. The correlation of the Fort Ancient Member with the lower Rowland has been corroborated by unpublished carbonate carbon isotopic studies, which indicate the Waynesville positive excursion (Bergström et al, 2010) in both units. In the following sections, we consider the detailed stratigraphy and correlations of these epiboles and marker intervals from the northwestern area of the Cincinnati Arch, near Louisville, Kentucky, moving counterclockwise to the southeastern and eastern side of the Cincinnati Arch near Mt.…”