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This is borne out by the chemical analyses the analyzed chlorites are among the highest reported in their Al/(Fe, Mg) ratios. The prevalence of assemblage (1), with its simple mineralogy, indicates that chlorite may be variable in the (Fe, Mg)/Al ratio in addition to the Fe/(Fe+Mg) ratio. Muscovite-stilpnomelane-chlorite-albite-microcline-quartz Muscovite-chlorite-chloritoid-epidote-hematite-magnetite-quartz Muscovite-paragonite-chlorite-chloritoid-quartz The most significant mineral assemblages found are: Two chlorite samples, one from a slate and one from a phyllite and a chloritoid sample from a phyllite, in addition to four rock samples, were chemically analyzed. Study of the mineralogy of the samples made use both of the x-ray diffractometer and the petrographic microscope. The grade decreases from east to west, and the rocks range correspondingly from phyllites to slates and shales. Regional metamorphism was later than the emplacement of the Taconic allochthone the meta-morphic grades in the Taconic sequence cut across structures, and conform to the trend in the surrounding autochthone. A number of samples, including carbonates, are from the Lower Ordovician to Middle Ordovician rocks of the surrounding autochthonous marble belt. Most of the rocks are argillaceous or arenaceous, of Early Cambrian to Middle Ordovician age, and are from the Taconic allochthone. Rocks from the Taconic Range and adjacent areas, near Castleton in west-central Vermont, have been studied for their mineral assemblages.