Sioux Quartzite-Morton Gneiss-Blue Mound State Park
One of the most curious Rocks in Blue Mound State Park. It is aprox. 1.6 billion years old. It has recently re-emerged. With the breaking of the WPA containment dam/swimming pond at the Blue Mounds this boulder has been completely unseen for over seventy five years. It can be found aprox. 100 yards west of …