The Rohwer War Relocation Center Cemetery is located here, and was [33], One of the most popular pastimes for those incarcerated at Manzanar was baseball. Between 1985 and 1995, the population of the Las Vegas Valley increased from 550,700 to 1,138,800. The valley is actually a graben with the oldest rocks being extensively metamorphosed and at least 1.7billion years old. [33][61] Fifteen were buried there, but only five graves remain, as most were reburied elsewhere by their families. [8] Some four to six million years old, the Furnace Creek Formation is the primary source of borate minerals gathered from Death Valley's playas. [60] Xanterra Parks & Resorts owns and operates a private resort, the Oasis at Death Valley,[38] which comprises two separate and distinct hotels: the Inn at Death Valley is a four-star historic hotel, and the Ranch at Death Valley is a three-star ranch-style property reminiscent of the mining and prospecting days. Small mammals are more numerous than large mammals, such as bighorn sheep, coyotes, bobcats, kit foxes, cougars, and mule deer.