Figure F5. A. 40Ar/39Ar age spectrum and (39Ar)K/(37Ar)Ca plot for Core 180-1117A-11R. White age spectrum assumes atmospheric (40Ar/36Ar)i = 295.5, the black spectrum is corrected using (40Ar/36Ar)i = 355.4 ± 4.2 from the isochron plot. B. Isochron plot for Core 180-1117A-11R plagioclase step heat experiment. MSWD = mean squared weighted deviates.

Figure F5. A. ⁴⁰Ar/³⁹Ar age spectrum and (³⁹Ar)_K/(³⁷Ar)_Ca plot for Core 180-1117A-11R. White age spectrum assumes atmospheric (⁴⁰Ar/³⁶Ar)_i = 295.5, the black spectrum is corrected using (⁴⁰Ar/³⁶Ar)_i = 355.4 ± 4.2 from the isochron plot. B. Isochron plot for Core 180-1117A-11R plagioclase step heat experiment. MSWD = mean squared weighted deviates.