The rock making up the Badlands formation were deposited from 75 million to 34 million years ago; they only started to erode away about half a million years ago. Because of this erosion, the Badlands is a treasure trove of fossils – reptile sea monsters, rhinoceroses, camels, three-toed horses, clams, ammonites and more.
Here’s a brief video showing the Badlands:
A couple of great day hiking trails to experience the Badlands include:
g Door Trail
g Notch Trail
Learn more about national park day hiking trails in my Best Sights to See at America’s National Parks guidebook.