I’m calling the soundscape “Opticentric” in keeping with the theme. It and the drawing were finished at about the same time.
After being educated in the geology of the Badlands, the traveler is tasked with something peculiar: to make what one sees match what one knows. The various sedimentary layers are color coded for when they were formed. White indicates about 30 million years ago; red indicates about 32 million years ago; grey and yellow about 35; black about 72.
If reconciling such time in a single glance weren’t hard enough, then you find out that we’ve found fossils from alligators and three-toed horses in these fossilized soils. The horse didn’t have a hoof then because three toes did a better job in its environment, which was lush and muddy, i.e., a subtropical rainforest!