The rock carvings on the Pyramid Lake Indian Reservation in Nevada...  ...ed that the symbols are much whiter than the gray rock they're carved into.He knew from his climate rese...  ...coating was probably left from the last time the rocks were submerged in water, which suggest...

Scientists attributed this unusu...  ...Scientists attributed this unusual rock carving as part of a fertility ritual, but perh...  ...kes it the oldest reliably dated instance of such rock