It flows through a valley of preglacial origin. The Teays River was the main stream of a preglacial river system. The watershed of the creek is within the filled-in valley of the preglacial Susquehanna River. That a divide existed between the preglacial Teays and the Miami watershed. The preglacial valley of Hull Creek is now buried. This was a drastic change as compared to preglacial times before 2 million years ago. The reason is that a continental glacier completely disrupts the preglacial drainage system. The preglacial drainage pattern was controlled by the rock structure. The ice sheet overrode the preglacial Teays creating ponds or glacial lakes. Downstream of downtown St. Paul the river enters its wide preglacial valley. A geological deposit in East Anglia marks the old preglacial northward course of the Rhine.