K analyzed with an Instrumetation Laboratories Model 343 digital flame photometer, using the LiBO2 fluxfusion technique and mineral calibration standards, by Genevieve Edsall. Ar was determined by isotope dilution using Ar38 tracers and a six inch radius Nuclide mass spectrometer equipped with automated peak steppping and digital data acquisition system, by D.L. Turner and Wilfrid D. Davis.
