2024-02-122024-02-1210.15786/13682875https://wyoscholar.uwyo.edu/handle/internal/5754https://doi.org/10.15786/13682875Obsidian Cliff, a Mountain of Black Glass, Yellowstone National Parkhttps://creativecommons.org/licenses/by/4.0/PhotographyStereoscopicYellowstone National ParkWyomingfigure