The window of Looking Glass Rock eroded through the Jurassic-age Entrada Sandstone, northern San Juan County.
https://geology.utah.gov/wp-content/uploads/ugs-logo-large.png00Utah Geological Surveyhttps://geology.utah.gov/wp-content/uploads/ugs-logo-large.pngUtah Geological Survey2014-02-26 12:03:412016-08-10 16:40:37POTD February 26, 2014: Looking Glass Rock, San Juan County, Utah