Fort Wayne Moraine

The Fort Wayne Moraine is considered contemporary to the last stages of the Valparaiso Moraine. Centered on Fort Wayne, Indiana, the northern leg of the moraine is mostly overlaid by the younger Wabash Moraine angling northeastward through Williams County, Ohio. It only becomes identifiable in Lenawee County, Michigan south and northeast of Adrian before ending in the intermingling of moraines around Ann Arbor. The south and eastern leg of the moraine follows the northern bank of the St. Marys River into the State of Ohio. At the north bend of the St. Marys River, the moraine arcs northeastward through Lima, continuing in a northward arc to reach north of U.S. 30 in Hancock County to pass through Upper Sandusky, again bending to the north to end 15 miles (24 km) to 20 miles (32 km) to the northeast.

Beginning northeast of Upper Sandusky in Wyandot, looping along the southern county boundary, entering Hardin County along its northern border with Hancock County. The moraine then runs, west of southwest to the moraine runs, southwest to Lima. From Lima it runs west and northwest along the right bank of the St. Mary's River to Ft. Wayne. Continuing northeast on the left bank of the St. Joseph River to Hudson, Michigan in Lenawee County. The moraine is 3 miles (4.8 km) or 4 miles (6.4 km) wide and has an undulating surface. Its main crest is 50 feet (15 m) to 75 feet (23 m) above the beds of the rivers that follow the outer border. The rivers are in trenches 20 feet (6.1 m) to 30 feet (9.1 m) deep. The moraine is 30 feet (9.1 m) to 50 feet (15 m) above the bluff or plain. The wide outer slope of a mile (1.6 km) or more provides any local relief. The drift is a clay till and has boulders.

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