![]() ![]() Early settlers found numerous bones of bison littering the ravine. Previous to their discovery here, most of these minerals had never been identified anywhere in Iowa.Īt the north end of the park is a narrow ravine named Boneyard Hollow. More recent studies of the efflorescence show that it is made of melanterite or rozenite, with some crystals of halotrichite and szomolnokite. This rock is named for the copperas (iron sulfate) efflorescences that form on the rock face during dry weather and may be completely washed away by a heavy rain.Ĭopperas is an ancient term. This is an iron-cemented pebble conglomerate. Īlong Prairie Creek, a unique area known as the Copperas Beds is exposed. The sandstone and other bedrock exposures in the park are some of the northernmost exposures of the lower Cherokee Group, rocks laid down during the Pennsylvanian Epoch. ![]() The creek and a smaller tributary known as Boneyard Hollow have eroded canyons through a 100-foot (30 m) high bluff, exposing a cross section of sandstone deposited by a Paleozoic river. The park contains two listings on the National Register of Historic Places: Dolliver Memorial State Park, Entrance Area (Area A) and Dolliver Memorial State Park, Picnic, Hiking & Maintenance Area (Area B).ĭolliver Memorial State Park is on the west bank of the Des Moines River at the mouth of a small tributary called Prairie Creek. The park is located 10 miles (16 km) south of Fort Dodge and 3 miles (4.8 km) northwest of Lehigh. Dolliver Memorial State Park is a state park of Iowa, US, featuring high bluffs and deep ravines on the Des Moines River. ![]()
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