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Album caption: Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton. Photomicrographs of coexisting staurolite (St) and epidote (Ep) in (A) sample 356-1 (plane-polarized light). Southwestern Massachusetts and adjacent Connecticut and New York. ca. 1966. Published as figure 8-A in U.S. Geological Survey. Professional paper 1113. 1981.
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Abum caption: Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton. Photomicrographs of chloritoid (CD)-biotite (Bt) assemblages. C, Sample 103-1A, with garnet. Southwestern Massachusetts and adjacent Connecticut and New York. ca. 1966. Published as figure 16-C in U.S. Geological Survey. Professional paper 1113. 1981.
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Album caption: Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton. Photomicrographs of triply zone plagioclase from (A) saple 3-3 (cross-polarized light). Southwestern Massachusetts and adjacent Connecticut and New York. ca. 1966. Published as figure 9-A in U.S. Geological Survey. Professional paper 1113. 1981.
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Album caption: Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton. Photomicrographs showing (B) late plagioclase including folded foliation defined by dust trains; the sigmoidal fold is in a single crystal, sample 340-1 (plane-polarized light). Southwestern Massachusetts and adjacent Connecticut and New York. ca. 1966. Published as figure 11-B in U.S. Geological Survey. Professional paper 1113. 1981.
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Album caption: Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton. Photomicrographs of cummintonite (Cum) assemblages for samples (B) 487-2 (plane-polarized light). Other minerals present are chlorite (Ch), biotite (Bt), and garnet (Ga). Southwestern Massachusetts and adjacent Connecticut and New York. ca. 1966. Published as figure 6-B in U.S. Geological Survey. Professional paper 1113. 1981.
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Album caption: Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton. Photomicrographs of cummintonite (Cum) assemblages for sample (A) 170-1 (plane-polarized light). Southwestern Massachusetts and adjacent Connecticut and New York. ca. 1966. Published as figure 6-A in U.S. Geological Survey. Professional paper 1113. 1981.
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Album caption: Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton. Photomicrographs showing (A) extreme habit adaptation of metamorphic plagioclase to the foliation surface of the rock, sample 423-1 (cross-polarized light); Southwestern Massachusetts and adjacent Connecticut and New York. c. 1966. Published as figure 11-A in U.S. Geological Survey. Professional paper 1113. 1981.
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Album caption: Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton. Photomicrographs of triply zoned plagioclase from (B0 sample 360-1 (cross-polarized light), showing the calcium-free rim in sharp contact with calcium-rich core. Compare with the profiles shown on figure 10. Southwestern Massachusetts and adjacent Connecticut and New York. ca. 1966. Published as figure 9-B in U.S. Geological Survey. Professional paper 1113. 1981.
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Album caption: Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton. Photomicrographs of chloritoid (Cd)-biotite (Bt) assemblages. A, Sample 338-1, with chlorite (Ch), garnet (Ga), and muscovite (Mu). Southwestern Massachusetts and adjacent Connecticut and New York. ca. 1966. Published as figure 16-A in U.S. Geological Survey. Professional paper 1113. 1981.
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Abum caption: Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton. Photomicrographs of sample 191-1 showing chlorite (Ch) rimming magnetite (Mt) (plane-polarized light). A "ghost" crystal of chloritoid ("Cd") is also shown. The magnetite and chloritoid are interpreted to be relicts of an erlier episode of metamorphism. Southwestern Massachusetts and adjacent Connecticut and New York. ca. 1966. Published as figure 19 in U.S. Geological Survey. Professional paper 1113. 1981.
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Abum caption: Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton. Photomicrographs of tourmaline. B, A mantle of tourmaline showing inclusion of a preexisting metamorphic foliation; sample 102-2 (plane-polarized light). Southwestern Massachusetts and adjacent Connecticut and New York. ca. 1966. Published as figure 16-A in U.S. Geological Survey. Professional paper 1113. 1981.
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Album caption: Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton. Photomicrographs of tourmaline. A, Zone tourmaline characteristic of tourmaline found in the area; a light-yellow core having rounded (detrital?) outline is mantled by a dark-bluish-gray overgrowth; sample 509-1 (plane-polarized light). Southwestern Massachusetts and adjacent Connecticut and New York. ca. 1966. Published as figure 13-A in U.S. Geological Survey. Professional paper 1113. 1981.
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Abum caption: Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton. Photomicrographs of chloritoid (Ch)-biotite (Bt) assemblages. D, Sample 509-1A, with garnet (Ga) and chlorite (Ch). All, plane-polarized light, Southwestern Massachusetts and adjacent Connecticut and New York. ca. 1966. Published as figure 16-D in U.S. Geological Survey. Professional paper 1113. 1981.
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Abum caption: Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton. Photomicrographs of chloritoid (Cd)-biotite (Bt) assemblages. B, Sample234-1, with chlorite (Ch), staurolite (St), muscovite (Mu), plagioclase (Pa), and ilmenite (Ilm). Southwestern Massachusetts and adjacent Connecticut and New York. ca. 1966. Published as figure 16-B in U.S. Geological Survey. Professional paper 1113. 1981.
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Album caption: Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton. Photomicrographs of sample 376-1 (cross-polarized light), showing ilmenite (Ilm) sandwiched between chlorite (Ch) plates. Also show is a bent (though not broken) ilmenite lath and stress-induced (?) twinning in a zoned porphyroblast of plagioclase (Pg). Southwestern Massachusetts and adjacent Connecticut and New York. circa 1966. Published as figure 4 in U.S. Geological Survey. Professional paper 1113. 1981.
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Album caption: Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton. Photomicrographs of coexisting staurolite (St) and epidote (Ep) in (B) sample590-1 (plane-polarized light) Other minerals present are garnet (Ga), biotite (Bt), and muscovite (Mu). Southwestern Massachusetts and adjacent Connecticut and New York. circa 1966. Published as figure 8-B in U.S. Geological Survey. Professional paper 1113. 1981


    map background search result map search result map Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton.  Southwestern Massachusetts and adjacent Connecticut and New York.  circa 1966. Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton.  Southwestern Massachusetts and adjacent Connecticut and New York. circa 1966. Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton.  Southwestern Massachusetts and adjacent Connecticut and New York.  circa 1966. Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton. Southwestern Massachusetts and adjacent Connecticut and New York. circa 1966. Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton. Southwestern Massachusetts and adjacent Connecticut and New York. circa 1966. Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton. Southwestern Massachusetts and adjacent Connecticut and New York.  circa 1966. Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton. Southwestern Massachusetts and adjacent Connecticut and New York. circa 1966. Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton. Southwestern Massachusetts and adjacent Connecticut and New York. circa 1966. Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton.  Southwestern Massachusetts and adjacent Connecticut and New York.  circa 1966. Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton.  Southwestern Massachusetts and adjacent Connecticut and New York.  circa 1966. Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton.  Southwestern Massachusetts and adjacent Connecticut and New York.  circa 1966. Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton. Southwestern Massachusetts and adjacent Connecticut and New York. circa 1966. Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton.  Southwestern Massachusetts and adjacent Connecticut and New York.  circa. 1966. Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton.  Southwestern Massachusetts and adjacent Connecticut and New York.  circa. 1966. Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton.  Southwestern Massachusetts and adjacent Connecticut and New York.  circa. 1966. Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton.  Southwestern Massachusetts and adjacent Connecticut and New York.  circa 1966. Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton.  Southwestern Massachusetts and adjacent Connecticut and New York. circa 1966. Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton.  Southwestern Massachusetts and adjacent Connecticut and New York.  circa 1966. Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton. Southwestern Massachusetts and adjacent Connecticut and New York. circa 1966. Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton. Southwestern Massachusetts and adjacent Connecticut and New York. circa 1966. Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton. Southwestern Massachusetts and adjacent Connecticut and New York.  circa 1966. Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton. Southwestern Massachusetts and adjacent Connecticut and New York. circa 1966. Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton. Southwestern Massachusetts and adjacent Connecticut and New York. circa 1966. Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton.  Southwestern Massachusetts and adjacent Connecticut and New York.  circa 1966. Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton.  Southwestern Massachusetts and adjacent Connecticut and New York.  circa 1966. Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton.  Southwestern Massachusetts and adjacent Connecticut and New York.  circa 1966. Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton. Southwestern Massachusetts and adjacent Connecticut and New York. circa 1966. Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton.  Southwestern Massachusetts and adjacent Connecticut and New York.  circa. 1966. Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton.  Southwestern Massachusetts and adjacent Connecticut and New York.  circa. 1966. Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton.  Southwestern Massachusetts and adjacent Connecticut and New York.  circa. 1966. Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton.  Southwestern Massachusetts and adjacent Connecticut and New York.  circa 1966. Metamorphic mineral assemblages of slightly calcic pelitic rocks in and around the Taconic allochton.  Southwestern Massachusetts and adjacent Connecticut and New York.  circa 1966.