Cation-ratio and accelerator radiocarbon dating of rock varnish on mojave artifacts and landforms.
Dorn RI, Bamforth DB, Cahill TA, Dohrenwend JC, Turrin BD, Donahue DJ, Jull AJ, Long A, Macko ME, Weil EB, Whitley DS, Zabel TH. Cation-ratio and accelerator radiocarbon dating of rock varnish on mojave artifacts and landforms. Science. 1986 Feb 21; 231(4740):830-3.