Color image of adult bison and calves at Blue Mounds State Park, 2007. Photograph by Wikimedia Commons user Rigadoun.

Adult bison and calves at Blue Mounds State Park

Adult bison and calves at Blue Mounds State Park, 2007. Photograph by Wikimedia Commons user Rigadoun.

Color image of a limestone seam under Stone Arch Bridge, 2016. Photograph by Paul Nelson.

Limestone seam under Stone Arch Bridge

Limestone seam under Stone Arch Bridge, 2016. Photograph by Paul Nelson.

Color image of a Platteville limestone seam in Fort Snelling State Park, 2016. Photograph by Paul Nelson.

Platteville limestone seam in Fort Snelling State Park

Platteville limestone seam in Fort Snelling State Park, 2016. Photograph by Paul Nelson.

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.

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