Structural, stratigraphic, and sedimentologic relations in northwest Ohio indicate that this part of the craton was the site of recurring tectonic activity throughout much of the Paleozoic. The locus of much of this activity was the Bowling Green fault, a complex north-trending zone of diverse fault types. At least six episodes of displacement can be documented, most of which involved vertical displacement along steeply dipping faults. The youngest structures in the fault zone are southwest-directed thrusts. Faulting began as early as the Ordovician Period and continued possibly as late as the Cenozoic Era.
Abrupt thickness changes, isopach and structure-contour trends, intraformational unconformities, and soft-sediment deformation structures in Ordovician and Silurian units are attributed to syn-depositional deformation associated with the Bowling Green and related faults. Silurian paleogeography in the region also was affected by ongoing tectonic activity.
The location of the Bowling Green fault and the cause for its long history of displacement appear to be related to the underlying Grenville front. Stresses associated with orogenic activity in the Appalachians, lithospheric flow, or forebulge migration were localized by the front and resulted in displacements in the overlying Paleozoic strata along and adjacent to the Bowling Green fault.
- Geological Society of America