Spires
Eroded bentonite spires take on a soft pink glow at twilight. Cathedral Gorge State Park, Nevada. From the park's website: "The park’s beauty began with explosive volcanic activity that, with each eruption, deposited layers of ash hundreds of feet thick... The cave-like formations and cathedral-like spires are the result of geologic processes from tens of millions of years ago.". Photo © copyright by Sarah Marino and Ron Coscorrosa.