Field Trip Photographs Sedimentology & Stratigraphy Course The College of Wooster Department of Geology Saturday, April 28, 2001 Trip to the Mississippian-Pennsylvanian Boundary in Jackson County, Ohio (Led by Professor Mark Wilson and Teaching Assistant Aaron Shear)   For the schedule and travel directions, see our Field Trip Itinerary page.   Our first outcrop along US Highway 35 about three miles west of Jackson, Ohio. The Mississippian Logan Formation, composed primarily of coarse siltstones and very fine sandstones, is unconformably overlain by sandy conglomerates of the Pennsylvanian Sharon Conglomerate. The unconformity, highlighted here in red, is very irregular at this outcrop. Vertical relief along it is measured in meters. The Logan Formation alternates between thinly-laminated siltstones and sandstones and massive sandstones with some hummocky cross-bedding and worm burrow trace fossils. We interpret these beds as having formed on a shallow marine shelf with occasional storms. The Sharon Conglomerate was deposited by braided streams cutting into the consolidated shelf sediments.     Members of the class, led by Scott Bagocius with the Jacob's Staff, examine the Logan Formation at the first stop.     Nick Welty and Rich Poole look closely at the thinly-bedded siltstones of the Logan Formation at Stop #1.     The Sed/Strat class (most of them, anyway) sit on the side of the highway and sketch the unconformity at the first stop.     Jessica Conroy snaps a photograph of the Logan Formation siltstones at Stop #1 (as well as Rachael Scott and Crystal Miller).     The Sed/Strat class scatters on the second outcrop, characterized by the Logan Formation at the base, followed by the massive "Sharon Conglomerate" and then dark shales and siltstones.     Abby Bowers risks her life for geology by climbing up the exposed "Sharon Conglomerate" at Stop #2. Our trusty College of Wooster bus is in the background.       Scott Bagocius ponders the "Sharon Conglomerate" at Stop #2.   Please see the Research Project Webpages this class completed. Return to the Sedimentology & Stratigraphy course page. We also have photographs from the April 2000 field trip. Return to the Wooster Geology Courses on the Web menu page.