Turtle Rock (Pulpit Rock, Rostrum Rock) (GM-37)
The bedrock floor of the Wabash Valley can be seen in places from near Delphi eastward to near Huntington. Meltwaters from glacial ice swept the ancient bedrock surface clean in places. Since then, this surface has been covered with unconsolidated materials and soil.

In places, rugged masses of rock rise boldly above the general level of the old bedrock surface. One of the largest is Turtle Rock, at the site of Cass Station, 5 miles east of Logansport, where a large remnant mass of Devonian limestone is perched on a narrow base of Kokomo limestone of Silurian age. Turtle Rock, standing about 20 feet about the surrounding area, has the shape of a flattened hourglass.

Less spectacular table-like masses of rock are found nearby. One of these has been cut through by a road a short distance west of Turtle Rock. Some are large enough to have houses built on them; other smaller ones are used for "hazards" on the Logansport Country Club golf course.

Our Hoosier State Beneath Us: Geomorphology