%0 Map %D 0 %T Bedrock geologic map of the Ayer 7.5’ quadrangle, Worcester and Middlesex Counties, Massachusetts (2015) %A Joseph P Kopera %K Ayer %K ayer granite %K Ayer Granodiorite %K Ayer Quadrangle %K Berwick %K Campbell Hill Fault %K chelmsford granite %K Clinton Newbury Fault %K Devens %K Harvard Conglomerate %K merrimack %K Oakdale formation %K pin hill %K Shepley's Hill %K Shirley Fault %K tadmuck brook schist %K Worcester Formation %X

Editing and review are still underway.  This map should be available in winter 2015/2016

%B Open File Report %7 15-01 %I Massachusetts Geological Survey %G eng %2

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%0 Map %D 2012 %T 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 %A Peck, J.A. %E Joseph P Kopera %K #BedrockMap %K #MGSPub %K andalusite %K ayer granite %K Berlin %K Bolton %K Boylston %K Clinton %K Clinton-Newbury Fault %K Devens %K Harvard %K Lancaster %K Leominster %K nashoba %K Oakdale Quartzite %K Peck %K phyllite %K quartzite %K Reuben's Hill Formation %K Sterling %K tadmuck brook schist %K Tower Hill quartzite %K Wekepeke Fault %K Worcester Formation %X This map is an interim product and will be superseded by an updated bedrock map of the quadrangle in 2016.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. %B Digital Conversion %7 DC12-01 %I Massachusetts Geological Survey %G eng %2 1:24000 %0 Map %D 2006 %T Preliminary bedrock geologic map of the Ayer quadrangle, Massachusetts %A Joseph P Kopera %K #BedrockMaps %K #MGSPub %K arsenic %K Ayer %K ayer granite %K Berwick formation %K Boxborough %K chelmsford granite %K Clinton-Newbury Fault %K Devens %K Fort Devens %K Groton %K Harvard %K Jahns %K LITTLETON %K Merrimack Terrane %K mylonite %K nashoba %K Nashua Trough %K Oakdale formation %K Shepley's Hill Landfill %K Shirley %K tadmuck brook schist %K Worcester Formation %X

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 The above version should be considered outdated.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

%B Open-File Report %7 OFR-06-02 %I Massachusetts Geological Survey %G eng %U http://www.geo.umass.edu/stategeologist/ %2

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