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Doll_1951.pdf

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aw GEOLOGY OF THE MEMPHREMAGOG QUADRANGLE AND THE SOU'I'HEASTERN PORTION OF THE IRASBURG QUAI)RANGLE VERMONT CHARLES G. DOLL VERMONT GEOLOGICAL SURVEY CHARLES G. DOLL, State Geologist Published by VERMONT DEVELOPMENT COMMISSION MONTPELIER, VERMONT BULLETIN NO. 3   1951 TABLE OF CONTENTS PAGE Abstract . ã  7 Introduction  . . . . . . . . . . . . . . . . . . . . . . . 8 General Statement  . . . . . . . . . . . 8 Location  . . . . . . . . . . . . . . . . . . . . . . . .
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    GEOLOGY OF THE MEMPHREMAGOG QUADRANGLE AND THE SOU I HEASTERN PORTION OF THE IRASBURG QUAI)RANGLE VERMONT CHARLES G. DOLL VERMONT GEOLOGICAL SURVEY CHARLES G. DOLL State eologist ublished by VERMONT DEVELOPMENT COMMISSION MONTPELIER VERMONT BULLETIN NO. 3 951  TABLE OF CONTENTS P GE Abstract ã Introduction General Statement 8 Location Acknowledgments Previous work Method of investigation Physiography 1 Topography 11 Weathering 2 Drainage 2 Glaciation 3 Sedimentary rocks 15 General statement 5 Cram Hill formation 6 General description 6 Type locality 6 Distribution 6 Relative thickness 7 Age 7 Lithological detail 7 Shaw Mountain formation 8 General description 8 Type locality 8 Distribution 8 Relative thickness 8 Age 9 Lithological detail 9 Northfield slate 0 General description 0 Type locality 0 Distribution 0 Relative thickness 1 Age 1 Lithological detail 1  PAGE Ayers Cliff formation 2 General description 2 Type locality ..................... 2 Distribution 2 Relative thickness ................... 3 Age ......................... 3 Lithological detail ................... 3 Barton River formation 5 General description ................. 5 Type locality ..................... 5 Distribution 5 Relative thickness ................... 6 Age ......................... 6 Lithological detail ................... 7 Slates ...................... 7 Phyllites ...................... 8 Quartites .................... 9 Limestones ..................... Schists ....................... 1 Irasburg conglomerate ................. 2 Westmore formation ................... 3 General description ................. 3 Type locality ..................... 3 Distribution 4 Relative thickness ................... 4 Age ......................... 4 Lithological detail ................... 5 Phyllites ...................... 5 Limestones ..................... 6 Quartzites .................... 6 Schists ....................... 6 Irruptive rocks ..................... 7 General statement .................... 7 The Bolton igneous group and associated granites ...... 8 Granite plutons ..................... 1 Sedimentary inclusions ................. 3 Age of the granites 4  P GE Sills and dikes 5 Pegmatites 7 Quartz veins 8 Structure 9 General statement 9 Indian Point syncline . 0 Indian Point segment 0 Brownington syncline 1 North Neighborhood anticline 2 Ware Brook thrust . 2 n echelon reentrants . 5 Black River fault 8 Summary of arguments for structural interpretations 58 Minor structures . 0 Folds . 0 Fauts 2 Bedding 3 Bedding cleavage relations 4 Sinuosity of beds 4 Plastic flow of the calcareous rocks . 5 Boudinage 6 Linear element 0 Metamorphism General statement Minerals Chlorite Biotite 2 Garnet 2 Andalusite 2 Staurolite 3 Sillimanite 3 Lime silicate minerals 3 Amphibole 4 Historical geology 4 Economic geology 7 References used 8
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