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Waynesville Formation
Key marker beds in the Waynesville Formation. Adapted from Aucoin and Bret...
GEOCHEMISTRY, CLAY MINERALOGY, AND TAPHONOMY OF THE FOSSIL-RICH BUTTER SHALES
Benthic community development in limestone beds of the Waynesville (upper Dillsboro) Formation (Cincinnatian Series, Upper Ordovician) of southeastern Indiana
General models of ecological diversification. II. Simulations and empirical applications
Petrology of the Cincinnatian Series Shales and Environmental Implications
Introduction to the thematic set: Rifts III: catching the wave
FIGURE 1 —Hardground from the Onniella epibole of the Waynesville Formati...
Relative model support for Kope (left column) and Waynesville (right column...
Ordinations of four representative Kope and Waynesville samples best fit by...
Some Upper Cincinnatian (Ordovician) colonial corals of north-central Kentucky
Stratigraphy and Paleoecology of the Richmond Group in Southeastern Indiana
Katian (Upper Ordovician) carbon isotope chemostratigraphy in the Neixiang area, central China: implications for intercontinental correlation
Subdivision of Lorraine and Richmond Groups of Quebec by Elemental Analyses of Calcareous Strata
Taphonomy and Paleoecology of Ordovician Trilobite Clusters, Bromide Formation, South-central Oklahoma
QUANTITATIVE ANALYSIS OF EPIZOANS ON SILURIAN STROMATOPOROIDS WITHIN THE BRASSFIELD FORMATION
ABSTRACT The Upper Ordovician Juniata Formation, Central Appalachian Basin, USA, is a thick succession of cyclically bedded arenites, wackes, and mudrocks. Sedimentary facies of the formation in West Virginia, Virginia, and Maryland indicate cyclic peritidal deposition along the northern shoreline of the basin. The subsurface Juniata Formation has been drilled throughout the basin, and long, continuous well logs are available for analysis of the cyclic deposition. A 2400-ft-long (731.52-m-long) gamma-ray (GR) log from the Preston 119 well, northern West Virginia, provides a proxy of terrigenous siliciclastic fluxes originating from the Taconic highlands, from the early Ashgillian to the Ordovician–Silurian transition. Strong cycling in the GR log shows evidence for Milankovitch-forced sea-level oscillations, hypothesized to have been produced by dynamic Late Ordovician glaciation in polar (southern) Gondwana. Juniata cycle frequencies are different from those of Quaternary Milankovitch cycles, with significantly higher obliquity and precession index frequencies, consistent with a 21.5 h Ordovician day and an Earth-Moon distance that was 95% of present day. These results support John Dennison’s long-held view that Milankovitch forcing of sedimentation took place in the early Paleozoic Appalachian Basin by action of remotely generated glacio-eustatic oscillations powered by glaciation on southern Gondwana, and that this sedimentary record has tracked “Earth’s movement through space.”