Platteville Limestone

Platteville limestone is a distinctive building stone of southeastern Minnesota and southwestern Wisconsin characterized by its gray color, rough texture, and many fossils. It was heavily used in the early decades of the building of the Twin Cities and Faribault.

Color image of a rocky outlook at Interstate State Park, 2014. Photograph by Minnesota Department of Natural Resources Staff.

Rocky outlook at Interstate State Park

Rocky outlook at Interstate State Park, 2014. Photograph by Minnesota Department of Natural Resources Staff.

Color image of Angle Rock at Interstate State Park, 2015. Photograph by Minnesota Department of Natural Resources Staff.

Angle Rock at Interstate State Park

Angle Rock at Interstate State Park, 2015. Photograph by Minnesota Department of Natural Resources Staff.

Color image of Bluff trail at Interstate State Park, 2015. Photograph by Minnesota Department of Natural Resources Staff.

Bluff trail at Interstate State Park

Bluff trail at Interstate State Park, 2015. Photograph by Minnesota Department of Natural Resources Staff.

Color image of Spring trillium at Interstate State Park, 2013. Photograph by Minnesota Department of Natural Resources Staff.

Spring Trillium at Interstate State Park

Spring Trillium at Interstate State Park, 2013. Photograph by Minnesota Department of Natural Resources Staff.

Color image of a pothole at Interstate State Park, 2013.

Pothole at Interstate State Park

Pothole at Interstate State Park, 2013. Photograph by Minnesota Department of Natural Resources Staff.

Black and white photograph of St. Croix River, Dalles of the St. Croix. Includes view of Showboat Inn and Interstate Bridge, 1905–1949.

View of Showboat Inn and Interstate Bridge

St. Croix River, Dalles of the St. Croix. Includes view of Showboat Inn and Interstate Bridge, 1905–1949.

Colorized post card view of the Dalles of the St. Croix, Interstate Park, Minnesota and Wisconsin, 1940.

Dalles of the St. Croix

Dalles of the St. Croix, Interstate Park, Minnesota and Wisconsin, 1940.

Colorized post card view of Old Man of the Dalles of the St. Croix and bridge over the river, 1920.

Old Man of the Dalles of the St. Croix

Old Man of the Dalles of the St. Croix and bridge over the river, 1920.

Colorized post card view of Devil’s Chair, Dalles of the St. Croix, 1910.

Devil’s Chair, Dalles of the St. Croix

Devil’s Chair, Dalles of the St. Croix, 1910.

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