TY - MAP T1 - Digital conversion of Peck, J.H., 1975, Preliminary bedrock geologic map of the Clinton quadrangle, Worcester County, Mass., U.S. Geological Survey Open File Report 75-658 Y1 - 2012 A1 - Peck, J.A. ED - Joseph P Kopera KW - #BedrockMap KW - #MGSPub KW - andalusite KW - ayer granite KW - Berlin KW - Bolton KW - Boylston KW - Clinton KW - Clinton-Newbury Fault KW - Devens KW - Harvard KW - Lancaster KW - Leominster KW - nashoba KW - Oakdale Quartzite KW - Peck KW - phyllite KW - quartzite KW - Reuben's Hill Formation KW - Sterling KW - tadmuck brook schist KW - Tower Hill quartzite KW - Wekepeke Fault KW - Worcester Formation AB - This map is an interim product and will be superseded by an updated bedrock map of the quadrangle in 2016. This map is a digital version of USGS OFR 75-658: http://pubs.er.usgs.gov/publication/ofr75658 There are some cartographic errors in creating a digital version: A Jurassic diabase dike along the western edge of the quadrangle is not shown in the digital version. These errors are being corrected. JF - Digital Conversion PB - Massachusetts Geological Survey U2 - 1:24000 ER - TY - MAP T1 - [Draft] Preliminary bedrock geologic map of the Lawrence quadrangle, Massachusetts Y1 - 2005 A1 - Castle, R.O. A1 - Hepburn, J.C. A1 - Joseph P Kopera KW - #BedrockMaps KW - #MGSPub KW - Andover KW - Andover Granite KW - Bedford KW - Berwick formation KW - Clinton-Newbury Fault KW - Dracut KW - Elliot formation KW - Lawrence KW - Methuen KW - nashoba KW - North Andover KW - tadmuck brook schist KW - Tewksbury JF - Open-File Report PB - Massachusetts Geological Survey U2 -

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ER - TY - MAP T1 - [Draft] Preliminary bedrock geologic map of the South Groveland quadrangle, Massachusetts Y1 - 2005 A1 - Castle, R.O. A1 - Hepburn, J.C. A1 - Joseph P Kopera KW - #BedrockMaps KW - #MGSPub KW - Andover KW - Andover Granite KW - Boxford KW - Boxford formation KW - Clinton-Newbury Fault KW - Fish Brook gneiss KW - Georgetown KW - Groveland KW - Haverhill KW - Methuen KW - Middleton KW - Nashoba terrane KW - North Andover KW - Sharpner's Pond diorite JF - Open-File Report PB - Massachusetts Geological Survey U2 -

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ER - TY - MAP T1 - Preliminary bedrock geologic map of the Ayer quadrangle, Massachusetts Y1 - 2006 A1 - Joseph P Kopera KW - #BedrockMaps KW - #MGSPub KW - arsenic KW - Ayer KW - ayer granite KW - Berwick formation KW - Boxborough KW - chelmsford granite KW - Clinton-Newbury Fault KW - Devens KW - Fort Devens KW - Groton KW - Harvard KW - Jahns KW - LITTLETON KW - Merrimack Terrane KW - mylonite KW - nashoba KW - Nashua Trough KW - Oakdale formation KW - Shepley's Hill Landfill KW - Shirley KW - tadmuck brook schist KW - Worcester Formation AB -

This preliminary version of the Bedrock Map of the Ayer Quadrangle (Kopera, 2006) has been removed pending the release of an updated version in the near future. The above version should be considered outdated. If you would like a copy of this map, please contact Joseph Kopera at jkopera[at]geo[dot]geo[dot] umass[dot]edu

JF - Open-File Report PB - Massachusetts Geological Survey UR - http://www.geo.umass.edu/stategeologist/ U2 -

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ER - TY - MAP T1 - Preliminary Bedrock Geologic Map of the Hudson 7.5' Quadrangle Worcester and Middlesex Counties, Massachusetts Y1 - 2014 A1 - Joseph P Kopera A1 - W.R. Hansen KW - #BedrockMaps KW - #MGSPub KW - acton granite KW - ayer granite KW - Berlin KW - Bolton KW - Boxborough KW - Clinton-Newbury Fault KW - gneiss KW - Harvard KW - Harvard Conglomerate KW - Hudson KW - magnetite KW - Malborough KW - marble KW - migmatite KW - nashoba KW - Stow KW - tadmuck brook schist KW - Vaughn Hills AB - The Hudson quadrangle straddles the Clinton-Newbury Fault Zone (CNFZ), which separates low metamorphic grade Silurian turbiditic metasediments and Devonian plutons of the Nashua sub-belt (Robinson and Goldsmith, 1991) of the Merrimack Terrane to the northwest from the high-grade, migmatitic Cambro- Ordovician arc-complex of the Nashoba Terrane (Walsh et al., 2011; Loan 2011). This general area comprises the suture between the Gander and Avalon composite terranes of the Northern Appalachians (cf. Hibbard et al., 2006). Metasedimentary rocks of the Merrimack Terrane are generally poorly exposed, with intrusives (Day, Dayp, SDgdt) and the Clinton-Newbury Fault zone and associated rocks (Ot) forming a prominent northeast trending ridge (Oak Hill in the town of Harvard) marking the eastern bordering slope of the Worcester Plateau (Emerson, 1917, p. 16). Elevation and local topographic relief gradually decreases and glacial cover increases to the east-southeast across the strike of the Nashoba Formation, which, locally, forms low-relief NE-trending strike-parallel ridges. These are cut by dramatic cross-strike cliffs and glacial spillway gorges developed along cross-strike joints and brittle faults, most notably on the western slopes of Rattlesnake Hill, southern slope of Powder House Hill and in Camp Resolute in Bolton in the west-central portion of the quadrangle, and the southern slope of the hill along the west side of Codman Hill Road in Harvard in the north-central portion of the quadrangle. The migmatitic ortho- and paragneisses, schists and associated metavolcanic rocks of the Nashoba Formation (_Sn) form a northeast striking belt underlying the southern two-thirds of the quadrangle. These are intruded by a variety of presumed Ordovician to Silurian intermediate intrusives (OSd, OSaqd) and Devonian or younger tonalites to granites (Dan, Danp, Dac). JF - Open File Report PB - Massachusetts Geological Survey U1 - Note: This map supersedes "Preliminary bedrock geologic map of the Hudson quadrangle, Massachusetts", MGS map published in 2005 Report accompanies map-- be sure to download both! ER - TY - MAP T1 - Preliminary bedrock geologic map of the Hudson quadrangle, Massachusetts Y1 - 2005 A1 - Joseph P Kopera A1 - Hansen, W.R. KW - #BedrockMaps KW - #MGSPub KW - acton granite KW - ayer granite KW - Berlin KW - Bolton KW - Boxborough KW - Clinton-Newbury Fault KW - gneiss KW - Harvard KW - Harvard Conglomerate KW - Hudson KW - magnetite KW - Malborough KW - marble KW - migmatite KW - nashoba KW - Stow KW - tadmuck brook schist KW - Vaughn Hills AB - This map has been superseded by MGS OFR 14-01: Preliminary Bedrock Geologic Map of the Hudson 7.5' Quadrangle Worcester and Middlesex Counties, Massachusetts This map is an interim update to W.R. Hansen's 1956 Bedrock Geology of the Hudson and Maynard 7.5' quadrangles (USGS Bulletin 1038). This draft version of the Bedrock Map of the Hudson Quadrangle (Kopera, 2005) has been removed pending the future release of an updated version. The above version should be considered outdated. If you would like a copy of this map, please contact Joseph Kopera at jkopera[at]geo[dot]geo[dot]umass[dot]edu

JF - Open-File Report PB - Massachusetts Geological Survey U2 -

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ER - TY - MAP T1 - Preliminary bedrock geologic map of the Westford quadrangle, Massachusetts Y1 - 2009 A1 - Joseph P Kopera A1 - D.C. Alvord A1 - Richard H Jahns A1 - M.E. Willard A1 - W.S. White KW - #BedrockMaps KW - #MGSPub KW - Acton KW - amphibolite KW - ayer granite KW - Berwick formation KW - Boxborough KW - calc-silicates KW - Carlisle KW - Chelmsford KW - chelmsford granite KW - Clinton-Newbury Fault KW - Concord KW - diorite KW - gneiss KW - Groton KW - LITTLETON KW - magnetite KW - marble KW - migmatite KW - Nashoba Formation KW - phyllonite KW - tadmuck brook schist KW - Tyngsborough KW - Westford AB - Bedrock Geologic Map contains brittle fracture data Mapping still in progress. For interim fracture database, please contact Joe Kopera JF - Open-File Report PB - Massachusetts Geological Survey U2 -

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ER - TY - MAP T1 - Progress report of bedrock geologic mapping of the Lowell quadrangle, Massachusetts Y1 - 2010 A1 - Richard H Jahns A1 - Joseph P Kopera KW - #BedrockMaps KW - #MGSPub KW - Berwick formation KW - Chelmsford KW - Clinton-Newbury Fault KW - Dracut KW - Dracut diorite KW - Dracut gabbro KW - Dracut pluton KW - gabbro KW - Jahns KW - Lowell KW - Methuen KW - nashoba KW - Nashoba Formation KW - Tewksbury KW - Tyngsborough AB -

Maps in Progress are not distributed to the public. If you would like to see a copy of this map, please contact Joseph Kopera at jkopera[at]geo[dot]geo[dot]umass[dot]edu

JF - Progress Map PB - Massachusetts Geological Survey U2 -

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