Desert Primrose (or Dune Evening Primrose,
Oenothera deltoides) flowers bloom white with yellow center, opening in the early evening and closing in mid-morning. Valley of Fire State Park (dedicated in 1935) is the oldest state park in Nevada. Starting more than 150 million years ago, great shifting sand dunes during the age of dinosaurs were compressed, uplifting, faulted, and eroded to form the park’s fiery red sandstone formations. The park also has fascinating patterns in limestone, shale, and conglomerate rock. The park adjoins Lake Mead National Recreation Area at the Virgin River confluence, at an elevation of 2000 to 2600 feet (610–790 m), 50 miles (80 km) northeast of Las Vegas, USA. Park entry from Interstate 15 passes through the Moapa Indian Reservation.