This cave differs from the others I’ve visited (Mammoth Cave, KY; Carlsbad Caverns, NM; Cave of the Mounds, WI) in that its formations are mostly boxwork, rather than stalactites and stalagmites. Boxwork is kind of like what you’d see if you built a castle of sugar cubes and mortared it with cement. The sugar cubes dissolve, and what is left is a kind of honeycomb of borders, criss-crossing each other. The calcite “mortar” that filled cracks in the limestone and dolomite is what remains. These structures were formed at the genesis of the cave, and not later by the action of dripping moisture, so they are speleogens rather than speleothems. (My new word for this section of the trip!) The ranger asked us what we thought it looked like. My first response was “a Jackson Pollack painting”.
So, early the next morning, we headed home across the tall grass prairie of South Dakota, past Badlands (which we will return to see), through Minnesota, across the Mississippi River, and back to our Wisconsin home on the conservation prairie. The lawn hadn’t been cut yet this year and was absolutely lush and about waist high. It made us almost giddy! A good old Midwestern thunderstorm washed my car of all the insects and dirt we’d accumulated on our trip.
Five thousand miles, eight National Parks and Monuments, five hundred photographs, and four new brake pads later…I’m back at the computer, dreading the news about what is happening to our public land. I am so glad to have had an opportunity to walk in those places, to breath, to see, to sleep under the stars. I hold a hope in my heart that my children and my future grandchildren will have the opportunity to get to know the America that I visited on this journey, and that it will endure in its character. I may never know what they will inherit, but I will try to do my part to protect it.