@Map {224, title = {Bedrock geologic map of the Marlborough quadrangle, Massachusetts}, year = {2004}, publisher = {Massachusetts Geological Survey}, edition = {GM-06-01}, keywords = {$\#$BedrockMaps, $\#$MGSPub, alaskite, amphibolite, Andover Granite, Ashland, Berlin, Bloody Bluff, Burlington Mylonite Zone, epidote, fault zone, gneiss, granite, granofels, Hope Valley Alaskite, Hopkinton, Hudson, Indian Head Hill, Lake Char, Malborough, Milford granite, Milham Reservoir, mylonite, Northborough, quartzite, schist, shear zone, Southborough, volcanic, Waltham Tectonic Melange, Westborough, Wolfpen Lens}, author = {Joseph P Kopera and DiNitto, R.G. and Hepburn, J.C.} } @Map {318, title = {Preliminary Bedrock Geologic Map of the Hudson 7.5{\textquoteright} Quadrangle Worcester and Middlesex Counties, Massachusetts}, year = {2014}, month = {09/2014}, publisher = {Massachusetts Geological Survey}, edition = {14-01}, abstract = {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).}, keywords = {$\#$BedrockMaps, $\#$MGSPub, acton granite, ayer granite, Berlin, Bolton, Boxborough, Clinton-Newbury Fault, gneiss, Harvard, Harvard Conglomerate, Hudson, magnetite, Malborough, marble, migmatite, nashoba, Stow, tadmuck brook schist, Vaughn Hills}, author = {Joseph P Kopera and W.R. Hansen} } @Map {226, title = {Preliminary bedrock geologic map of the Hudson quadrangle, Massachusetts}, year = {2005}, publisher = {Massachusetts Geological Survey}, abstract = {This map has been superseded by MGS OFR 14-01: Preliminary Bedrock Geologic Map of the Hudson 7.5{\textquoteright} Quadrangle Worcester and Middlesex Counties, Massachusetts This map is an interim update to W.R. Hansen{\textquoteright}s 1956 Bedrock Geology of the Hudson and Maynard 7.5{\textquoteright} 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

}, keywords = {$\#$BedrockMaps, $\#$MGSPub, acton granite, ayer granite, Berlin, Bolton, Boxborough, Clinton-Newbury Fault, gneiss, Harvard, Harvard Conglomerate, Hudson, magnetite, Malborough, marble, migmatite, nashoba, Stow, tadmuck brook schist, Vaughn Hills}, author = {Joseph P Kopera and Hansen, W.R.} }