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Stratigraphic Notes, 1992 Stratigraphic Notes, 1992 Stratigraphic Notes, 1992 U.S. GEOLOGICAL SURVEY BULLETIN 2060 Four short papers propose changes in stratigraphic nomenclature in Vermont, Virginia, Maryland, and the District of Columbia UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON: 1994 U.S. DEPARTMENT OF THE INTERIOR BRUCE BABBITT, Secretary U.S. GEOLOGICAL SURVEY GORDON P. EATON, Director For sale by U.S. Geological Survey, Information Services Box 25286, Federal Center, Denver, CO 80225 Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government. Published in the Eastern Region, Reston, Va. Manuscript approved for publication August 20, 1993. Stratigraphic Notes, 1992 ISSN 1071-7102 CONTENTS Note Page 1. Changes in Stratigraphic Nomenclature in the Eastern Cover Sequence in the Green Mountain Massif from Ludlow to West Bridgewater, Vermont ....................... 1 By Nicholas M. Ratcliffe 2. The Wilcox Formation of Vermont Assigned to the Mount Holly Complex ............. ll By Nicholas M. Ratcliffe 3. Definition and Nomenclature of the Robertson River Igneous Suite, Blue Ridge Province, Virginia ................................................................................... 19 By Richard P. Tollo 4. The Dalecarlia Intrusive Suite and Clarendon Granite in the Potomac Valley, Washington, D.C., Virginia, and Maryland ............................................................... 25 By Avery Ala Drake, Jr., and Anthony H. Fleming PLATES [Plates are in pocket] 1.1. Geologic maps of the Ludlow, Plymouth, and Killington areas, Vermont. 2.1. Geologic map of the Wilcox Hill area in the Rutland and Killington Peak quadrangles, Vermont. 3.1. Geologic map of the Robertson River Igneous Suite and adjacent rocks in northern and central Virginia. 4.1. Generalized geologic map of parts of the Washington West and Falls Church 7 .5-minute quadrangles. FIGURES 1.1. Photographs of rock samples from the Mount Holly Complex and the Saltash Formation....................................... 4 1.2. Chondrite normalized rare-earth-element diagram of samples of albitic gneisses from Brace's unit A of the Saltash Formation compared to similar salt-and-pepper-textured gneiss from the Mount Holly Complex.............. 4 1.3. Normative An-Ab-Or plot of samples of gneisses in table 1.1 from the Mount Holly Complex in the Killington Peak and Plymouth quadrangles compared to similar felsic gneiss in the Weston quadrangle . .. .. ... .. ....... .. 6 1.4. Correlation chart of previous usage and present interpretation.................................................................................. 7 1.5. Photograph of hand specimen of typical gneiss exposed at cliffs in the Plymouth quadrangle east of Black Pond............................................................................................................................................................................ 8 1.6. Diagrammatic west-to-east section showing inferred depositional relations of basal cover sequence rocks west and east of the Green Mountain basement rocks in Early Cambrian time................................................................. 9 2.1. Generalized map of the northern half of the Green Mountain massif showing the location of the Wilcox Formation after Brace (1953) as shown in Doll and others (1961)............................................................................ 12 2.2. Generalized map of the same area as figure 2.1, after Thompson and others (1990), showing Karabinos' (1987) revised interpretations of the Wilcox Hill area and vicinity . ... .. .. ......... .... .. .. ............. ..... ... ... ... 13 Ill IV CONTENTS 2.3. Photograph showing hand specimen of chlorite-spotted garnet quartzite and photomicrograph of gneiss from locality 2, 3 km north of Wilcox Hill ........ ... .... .. ......... .. ... ............. ... .......... ...... ......... ... ...... ................. 16 2.4. Photograph showing hand specimen and photomicrograph of chlorite-spotted retrograded garnet gneiss from locality 3 on Wilcox Hill . ....... .. ... ............ .. ............ .... .. ......... .... ... ......... ..... ............ .................. ............. 16 3.1 Age correlation diagram for the constituent lithologic units of the Robertson River Igneous Suite and Mechum River Formation.................................................................................................................................. 21 4.1. Normative feldspar plot comparing rocks of the Dalecarlia Intrusive Suite with those of the Georgetown Intrusive Suite and the Kensington Tonalite ....... .. .............. .... .. ............. .. .......... .................... ... .. ........... .......... 26 4.2. Diagram of Shand's index showing different tectonic environments of granitoids ........................................... 29 4.3. AFM diagram for samples from the Dalecarlia Intrusive Suite......................................................................... 29 4.4. Ti02-Fe0-Fe20 3 diagram for samples from the Dalecarlia Intrusive Suite showing their oxidation state ........ .. ......... .. ..... ......... ... ................ ................ ........... ... ...... ... ........ ............. ..... ............ ..... 30 4.5. Diagram of oxidation ratio verus differentiation index of samples from the Dalecarlia Intrusive Suite........... 30 4.6. Chondrite-normalized plots of samples from the Dalecarlia Intrusive Suite..................................................... 30 4.7-4.10. Discriminant diagrams for samples from the Dalecarlia Intrusive Suite: 4.7. Rb-(Yb+Ta) ............................................................................................................................................ 31 4.8. Rb-(Y+Nb) ............................................................................................................................................. 31 4.9. Ta-Yb...................................................................................................................................................... 32 4.10. Nb-Y....................................................................................................................................................... 32 TABLES 1.1. Major-element compositions of gneiss and altered gneisses near the eastern margin of the Green Mountain massif in the Killington Peak and Ludlow quadrangles, Vermont .. .. ............ ... ............ .... ........ .......... ... ......... .. .. 5 4.1. Chemical analyses, C.I.P. W. norms, and trace and rare earth element abundance of rocks of the Dalecarlia Intrusive Suite.............................................................................................................................................................. 28 METRIC CONVERSION FACTORS Multiply By To obtain Length millimeter (mm) 0.0394 inch centimeter (em) 0.3937 inch meter (m) 3.281 foot kilometer (km) 0.6214 mile Area square centimeter (cm 2) 0.1550 square inch square meter (m2) 1.196 square yard Volume cubic centimeter ( cm3) 0.06102 cubic inch liter (L) 1.057 quart 1. Changes in Stratigraphic Nomenclature in the Eastern Cover Sequence in the Green Mountain Massif from Ludlow to West Bridgewater, Vermont By Nicholas M. Ratcliffe ABSTRACT graphic sequences, here called the Tyson and Plymouth For­ mations, which probably are, in part, lateral facies Detailed mapping of the cover sequence rocks overly­ equivalents. Both sections, which contain beds of shallow­ ing the Green Mountain massif from Ludlow north to West water shelf-sequence carbonate rocks near their tops, proba­ Bridgewater in Vermont indicates that the presently bly are the extension of the Cambrian miogeoclinal shelf accepted concept of a continuous easterly topping section east of the Green Mountain core as suggested by Perry from the Tyson Formation to the Pinney Hollow Formation (1929), Keith (1932), and Thompson (1972). The existing is incorrect. Instead, two similar sequences as defined stratigraphic nomenclature (Doll and others, 1961) does not herein, the Tyson Formation and the Plymouth Formation, describe adequately the rock bodies present, nor does· it are in thrust fault contact, which creates a structural repeti­ unambiguously relate them to correlative units along strike. tion of the two sections. Each section rests on Middle Prot­ The stratigraphic sequences discussed here rest with erozoic rocks, and each passes upward into quartzite and angular discordance on Middle Proterozoic rocks of the beds of dolostone and black carbonaceous schist or phyllite. Mount Holly Complex. Locally preserved basal conglomer­ The Tyson Formation contains beds typical of the Hoosac ates, often very coarse grained, contain fragments of the Formation, which replaces the Tyson to the south. It is pro­ Mount Holly as described by Perry ( 1929). The lower part posed that the Plymouth Formation consists of deeper water, of the section contains gritty feldspathic quartzite, black finer grained and better laminated sediments than those of phyllite, and quartzite originally assigned to the Mendon the Tyson and part of the Hoosac, consistent with west- to series of Perry (1929) or to the Saltash Formation of Brace east-deepening condition of deposition. In addition, rocks (1953). Brace mapped an overlying sequence of conglomer­ previously assigned to the base of the Tyson Formation or atic quartzite and dolostone that he believed lay unconform­ Saltash Formation by previous authors
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