Environment | Page 33

Karst sinkholes

Trees jut out from a karst sinkhole in a field near Harmony in Fillmore County, Minnesota. Photograph by Amy Jo Hahn, 2018.

Karst sinkholes

Trees jut out from a karst sinkhole in a field near Harmony in Fillmore County, Minnesota. Photograph by Amy Jo Hahn, 2018. Used with the permission of Amy Jo Hahn.

Aerial view of sinkholes in Fillmore County

Aerial view of sinkholes outside Fountain in Fillmore County, July 3, 2011.

Karst Topography in Fillmore County

Southeast Minnesota boasts a unique geological landscape of rolling hills, fertile fields, dramatic bluffs, and freshwater streams. Beneath its lush surface is a hidden world of underground caves and rivers created after thousands of years of rain and snow seeped through fractured bedrock, slowly softening and dissolving sedimentary rock.

Maggie Sengoge and Porky White making maple sugar

Maggie Sengoge and Porky White tapping a tree for maple sap

Maggie Sengoge and Porky White drill into a tree in order to collect maple sap as part of the Heart of the Earth Survival School. Photograph by Randy Croce, 1984.

Maddy Moose making maple sugar at the Heart of the Earth Survival School

Maddy Moose making maple sugar at the Heart of the Earth Survival School (of Minneapolis) sugar bush camp, Maple Plain. Photograph by Randy Croce, 1984.