Dorset, Bennington County, Vermont
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'I. SURVEY OF HIGHJAY CONSTRUCTION MATERIALS IN THE TOWN OF DORSET, BENNINGTON COUNTY, VERMONT prepared by Eiigtneertng-Ceology Section, laterials Division Vermont Department of Highways in cooperation with United States Department of Commerce Bureau of Public Roads Hontpelier, Vermont March, 1968 TABLE OF CONTENTS Introduction Acknowledgements . 1 IIistory • • • • • • • • • • • • • 1 rnclosures . • • • 2 Location . 4 County and Town Outline Map of Vermont Survey of Rock Sources Procedure of Rock Survey . • 6 Discussion of Rock and Rock Sources . • . • 7 Survey of Sand and Gravel Deposits Procedure for Sand and Gravel Survey . 10 Discussion of Sand and Gravel Deposits . 11 Summary of Rock Formations in the Town of Dorset . • 13 Glossary of Selected Geologic Terms . 15 Bibliography . • • • • 17 Partial Specifications for Highway Construction Materials . Appendix Dorset Granular Data Sheets . Table I Dorset Property Owners - Granular . Supplement Dorset Rock Data Sheets . Table II Dorset Property Owners - Rock . Supplement Granular Materials Map . Plate I Rock Materials Map . Plate 11 page 1 Acknowledgments The work of this Project was greatly implemented by the cooperation and assistance of many groups and individuals. The following were partic- ularly helpful in carrying out the Project's objectives: 1. Various departments and individuals of the Vermont State Department of Highways, notably the Planning and Mapping Division and the Highway Testing Labo- ratory, 2. Professor D.P. Stewart of Miami University, Oxford, Ohio, 3. Professor C.G. Doll, Vermont State Geologist, Uni- versity of Vermont, Burlington, Vermont, 4. United States Department of Commerce, Bureau of Public Roads. Hist ory The Materials Survey Project was formed in 1957 by the Vermont State Department of Highways with the assistance of the United States Bureau of Public Roads. Its prime objective was to compile an inventory of highway construction materials in the State of Vermont. Prior to the efforts of the personnel of the Survey as described in this and other reports, searches for highway construction materials were conducted only as the immediate situation required. Thus only limited areas were surveyed, and no over- all picture of material resources was available. Highway contractors or resident engineers are usually required to locate the materials for their respective projects and have samples tested by the Highway Testing Labo- ratory. The additional cost of exploration for construction materials is I passed onto the State in the form of higher construction costs. The Ma- It terials Survey Project was established to minimize or eliminate this fac- tor by enabling the State and its contractors to proceed with information page 2 on material sources available beforehand. Prior knowledge of locations of suitable material is an important factor in planning future highways. The sources of construction materials are located by this Project through ground reconnaissance, study of maps and aerial photographs, and geological and physiographic interpretation. Maps, data sheets, and work sheets for reporting the findings of the Project were designed with their intended use in mind. These maps and data sheets were devised to furnish information of particular use to the contractor or construction man. For maximum benefit, the maps, data sheets, and this report should be studied simultaneously. Inc losures Included in this folder are two surfacegeology maps, one defining the I location of tests conducted on bedrock sources, the other defining the loca- tion of tests conducted on granular materials. These.maps are derived from 15-minute or 7~-minute quadrangles of the United States Geological Survey enlarged or reduced to 1:31250 or 1" = 2604 1 . Delineated on the Bedrock Map are the various rock types of the area. This information was obtained from numerous sources: Vermont Geological Survey Bulletins, Vermont State Geologist Reports, United States Geological Survey Bedrock Maps, and the Centennial Geological Map of Vermont, as well as other references. The granular materials map depicts areas covered by various types of glacial deposits (outwash, moraines, kames, kame terraces, eskers, etc.) by which potential sources of gravel and sand may be recognized. This infor. niation was obtained primarily from a survey being conducted by Professor D.P. Stewart of Miami University, Oxford, Ohio, who has been mapping the glacial features of the State of Vermont during the summer months since page 3 1956. Further information was obtained from the Soil Survey (Reconnaissance) of Vermont conducted by the Bureau of Chemistry and Soils of the United States Department of Agriculture, and from Vermont Geological Survey Bul- letins, United States Geological Survey Quadrangles, aerial photographs, and other sources. On both maps the areas tested are represented by Iden- tification Numbers. Several tests are usually conducted in each area repre- sented by an Identification Number, the number of such tests being more or less arbitrarily determined either by the character of the material or by the topography. Also includod in this folder are data sheets for both the Bedrock and Granular Materials Survey, which contain detailed information for each test conducted by the Project as well as information obtained from other sources, and including an active card file compiled by the Highway Testing Laboratory. The latter information was gathered over a period of years by many persons and consequently lacks the organized approach and detail required for effec- tive use. The information on the cards varied widely in completeness. Trans- fer of information from the cards to the data sheets was made without elab- oration or verification. When possible, the locations of the deposits listed in the card files have also been plotted on the maps; however, some cards in the file were not used because the information on the location of the deposit was incomplete or unidentifiable. Caution should be exercised wherever this information appears incomplete. This Project does not assume responsibility fcr the information taken from the card files. Work sheets contain more detailed information on each test and a de- tailed sketch of each Identification Number Area. The work sheets and laboratory reports are on file in the office headquarters of this Project. Page4 LOCATION The town of Dorset is located in the north part of Bennington County in the southwest corner of the State. Dorset is bounded on the north by the towns of Danby and Mount Tabor. Peru lies to the east; the towns of Winhall and Manchester border it on the south; and Rupert lies to the west. (See County and Town Outline Map of Vermont on the following page.) Three physiographic regions are represented in Dorset. The Green 1ountains Physiographic Region forms a picturesque front that rises above the east side of the Batten Kill valley on the east side of Dorset. The valleys of the Batten Kill and its West Branch comprise the Limestone Val- ley or Vermont Valley Physiographic Region. The Taconic Range occurs in the north, central, and western parts of town. In general, the terrain in Dorset is mountainous to rolling, and it has abrupt to gentle relief. Elevations on the western front of the Green Mountains vary from 2,000 feet to 2,700 feet, while elevations in the Taconic Range vary from 2,200 feet to 3,700 feet. Drainage in Dorset Is mainly southward via the Batten Kill and its West Branch and their numerous tributaries. Notable amoung these are Mad Tom and Little Mad Tom brooks that enter the Batten Kill just south of East Dorset. Two drainage divides in the town of Dorset are associated with the origins of three major streams. The source of the Batten Kill is on Dor- set Peak northwest of North Dorset Village. This stream enters its val- ley a short distance south of a marshy area that is the source of the north-. flowing Otter Creek. In the west part of Dorset the West Branch rises on the north side of Bear Mountain. This stream enters the somewhat narrow valley south of Page 5 Dorset Village, a short distance south of the point where a tribu- tary of the northwest_flowing liettawee River begins. Other tributaries of the Hettawee drain the south side of Dorset hountain and the west slopes of Netop Nountain and Dorset Hill. C A N A 0 A N CANAAN YTAAALA TIORTON / 5 RRSITIVE S I 1 N CNFO?O o _ START ROLl AND / ENCATU "' N 5 TATE /VEWpOR; 5 I / ... 5 --'N VIRILE£ iN WARTTRS CRATIT C'- ICIERYS/ ,>N' N ,/ N ShELTON / N 1ZICORE/ ISLE LA ROTT ) SNRNTOR I N MORGAN IVIOTNIELS COVENTRY 7'N / / LUMINCTOII EVLSBILAC I / N' / I / N V/ -( LEWIS / N ROSTGONEAY N' N CRESTON/ N N / N ' N / Si VLBVTS RDWNIhCTON N /)( N 1. 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