COSMOGENIC BURIAL DATING AND MAGNETOSTRATIGRAPHY OF EARLY AND MID-PLEISTOCENE MISSOULA FLOOD SEDIMENTS, HANFORD, WA
We test these possibilities by cosmogenic burial dating (Granger and Musikar, 2001), using the differential radioactive decay of 26Al and 10Be. We sampled 2 paleosols from drill cores of eastern Cold Creek bar as well as 14 kyr Missoula Flood sediments from Badger Coulee for cosmogenic burial dating. We chose the paleosols to increase the likelihood that sufficient cosmogenic nuclides would have accumulated in the samples prior to burial to allow application of this technique. We analyzed the 14 kyr sample to provide an estimate of the inherited cosmogenic nuclide ratio. Measurable inherited concentrations in the same proportion as that produced at the surface would indicate that burial dating could be applied throughout the stratigraphy. If not, then only the paleosols should be dated by this technique. Initial results suggest that sufficient cosmogenic nuclides concentrations are present in these sediments to make burial dating feasible.