Figure F4. A. 40Ar/39Ar age spectrum and (39Ar)K/(37Ar)Ca plot for Core 180-1118A-70R step heat experiment. B. Isochron plot for Sample 180-1118A-70R plagioclase step heat experiment. MSWD = mean squared weighted deviates.

Figure F4. A. ⁴⁰Ar/³⁹Ar age spectrum and (³⁹Ar)_K/(³⁷Ar)_Ca plot for Core 180-1118A-70R step heat experiment. B. Isochron plot for Sample 180-1118A-70R plagioclase step heat experiment. MSWD = mean squared weighted deviates.