Table 1. Laser step-heating Ar isotope data for plagioclase separates from Mount Lombard sandstone samples DJ.753.9, DJ.753.8 and DJ.753.2. Table 2. Isotope data for one-step single-grain laser-fusion analyses of plagioclase from Mt. Lombard sandstone DJ.753.2. Figure 1.36Ar/40Ar-39Ar/40Ar correlation diagrams and incremental 39Ar release spectra for plagioclase separates from Mount Lombard Association B sandstones.

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