| Popis: |
Detailed measured sections from the short stratigraphic interval spanning the Pittsburgh to Fishpot Limestone (Late Pennsylvanian) in Athens County, Ohio contain a range of lithologies that are interpreted as a complex suite of continental environments including fluvial (braided, meandering, and anastomosed) and palustrine deposits. Five 4th-order sequences are present based on a model in which interfluve paleosol profiles representing both Falling Stage and Lowstand Systems Tracts, are adjacent to incised braided fluvial deposits representing Lowstand and early Transgressive Systems Tracts (TST). Limestone deposition is mainly restricted to the late TST and was followed by either anastomosed or meandering fluvial deposits of the Highstand Systems Tracts. This model of continental sequence stratigraphy is broadly consistent with a previously published model for 3rd-order relative sea level changes on a passive margin. The variations between the models result from differences in tectonic setting and 3rd-order and 4th-order eustatic rates. |
