Stratigraphy and paleoenvironmental analysis of the Frasnian-Famennian (Upper Devonian) boundary interval in Tioga, north-central Pennsylvania

Two pulses of extinction in the late Frasnian (Late Devonian), the Lower and Upper Kellwasser (LKW and UKW) events, coincided with the deposition of organic-rich strata in many parts of the world, including the Appalachian Basin. Here, we describe two stratigraphic sections from Tioga, north-central Pennsylvania, that span the Frasnian-Famennian (F-F) boundary interval. The F-F boundary and UKW-equivalent strata are probably located in the...