Dataset associated with repository entry, entitled "Locally Derived, Meteoric Fluid Infiltration was Responsible for Widespread Late Paleozoic Illite Authigenesis in the Appalachian Basin." These data were generated as a chapter used to fulfill degree requirements for the PhD dissertation of Austin Boles (DeepBlue repository item http://hdl.handle.net/2027.42/136996). Four tables are included in this Excel Spreadsheet: Table 1: Results from Quantitative X-ray Powder Diffraction of mudstone samples from the Appalachian Basin. Table 2: Hydrogen isotopic results of mudstone samples from the Appalachian Basin. Table 3: Results of linear regression analysis of hydrogen isotope data to unmix isotopic signatures of mixed clay mineral populations. Table 4: Sample locations and descriptions for mudstone samples from the Appalachian Basin.