From the country's deepest canyon to sacred volcanic towers in the sky, these rock formations are as mesmerizing as they are ...

One of the best places to see hoodoos is in southern ... natural amphitheaters filled with craggy columns composed of sedimentary rocks like sandstone and shale. This area is particularly prone ...

Richard Edan / Getty Images Oil shale is a type of sedimentary rock formation that can be used to produce oil and gas. Oil shale can produce oil and gas because of the presence of kerogen ...