Mosaic Canyon is a beautiful geologic wonderland in Death Valley National Park. Limestone rocks known as Noonday Dolomite were formed here 750 to 900 millions years ago. Over time, faults and running water sculpted the canyon into beautiful marble walls. This slot canyon is a joy to explore and is the perfect example of an outdoor museum. Mosaic Canyon is very steep and rugged and Death Valley is the hottest place on Earth. Please explore with extreme caution. *4 wheel drive is recommended to reach the trailhead.