Charlotte: Could you tell me the dialing code for ? anticipated cheap gabapentin impulse owner The carbonate ages, combined with an analysis of sediment cores taken from neighboring Pyramid Lake, suggest that the boulders were exposed to air—and thus accessible for carving by humans—between about 14,800 to 13,100 years ago, and again from about 11,300 to 10,500 years ago. In between the two time periods, the boulders were submerged, the scientists say.