This was done on sixteen samples of the lake bed. It is fed by springs in the lake bed. The Spirit rover landed in what was thought to be a large lake bed. Two runways and a runway were available for landings on the dry lake bed. The CCC also landscaped the park using natural vegetation from the Pinnacle Lake bed. The Spirit rover landed in what was thought to be a huge lake bed. It is possible that there is still unexploded ordnance settled into the lake bed. The valley is formed from the ancient lake bed. The site is on an ancient Pleistocene lake bed. Area 51 is near Groom Lake, a dry salt lake bed. Parts of the lake bed were claimed for agriculture; wheat and turnips were being planted. Vehicle driving attempts to score land speed records are performed on the dry lake bed. Space shuttle landings on the lake bed took place on Runways 05/23, 15/33 and 17/35. The larger lake bed, Rogers, encompasses of desert. A tunnel was dug through the lake bed, but the plan was a failure.