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In	  Western	  Massachusetts	  a	  package	  of	  rocks,	  known	  as	  the Damon	  Pond	  section,	  has	  been	  the	  focus	  of	  ongoing	  study	  due to	  characteristics	  signifying	  it	  may	  have	  formed	  under suspected	  ultra-­‐high	  pressure	  (UHP)	  conditions.	  Currently there	  are	  no	  confirmed	  UHP	  terranes	  in	  North	  America	  causing research	  surrounding	  this	  package	  of	  rocks	  to	  be	  of	  particular significance.	  In	  order	  to	  better	  understand	  the	  Damon	  Pond section	  and	  a	  mechanism	  of	  emplacement	  for	  this	  potential UHP	  terrane,	  more	  must	  be	  known	  about	  its	  size	  and	  the surrounding	  strata.	  Prior	  to	  this	  study,	  relatively	  little	  was known	  about	  the	  units	  of	  rock	  surrounding	  this	  unique package	  despite	  it	  being	  previously	  mapped.	  Field observations,	  structural	  measurements,	  and	  samples	  were collected	  from	  in-­‐situ	  outcrops	  surrounding	  the	  Damon	  Pond section	  where	  it	  is	  exposed	  at	  the	  edge	  of	  the	  Goshen	  Dome	  in order	  to	  determine	  the	  lithologic	  units	  present	  and	  if	  they show	  signs	  of	  disruption	  indicating	  the	  Damon	  Pond	  section	  is more	  extensive	  than	  currently	  mapped.	  Petrographic	  analyses were	  conducted	  on	  11	  representative	  samples	  from	  the surrounding	  area	  focusing	  on	  the	  metamorphic	  mineral assemblage,	  relative	  abundance	  of	  minerals,	  notable	  structural characteristics,	  distribution	  of	  mineral	  grains,	  size	  variance	  of mineral	  grain	  populations,	  and	  the	  spatial	  association	  of metamorphic	  minerals.	  The	  Damon	  Pond	  section	  was	  found	  to be	  distinctly	  different	  from	  the	  surrounding	  lithology	  due abundant	  megacrystic	  garnet	  and	  kyanite,	  nesting	  boudinage features,	  and	  significant	  folding	  that	  disrupts	  the	  preexisting mineral	  foliation,	  which	  were	  not	  found	  to	  be	  present	  in	  the surrounding	  units.	  Three	  divisions	  based	  on	  rock	  type	  were made	  in	  the	  surrounding	  lithology	  from	  analysis	  of	  hand samples	  and	  thin	  sections,	  independent	  of	  their	  location	  in	  the field.	  	  When	  plotted	  on	  the	  map,	  spatial	  location	  of	  the	  samples showed	  these	  lithologic	  divisions	  to	  be	  consistent	  along	  strike with	  no	  repeating	  sections	  or	  disruptions	  that	  would	  indicate significant	  folding	  or	  faulting.	  The	  strike	  and	  dip measurements	  of	  foliation	  were	  consistent	  across	  the	  divisions Figure 1: Regional map showing Goshen Dome relationship with the post-Taconian tectonic cover (Topafter Karabinos et al., 1998). Geologic map (Middle) and cross section (Bottom) through the dome, Damon Pond section shown in red (modified from Hatch and Warren) 1981). whereas	  the	  mineral	  lineation	  varied between	  the	  gneiss	  and	  schist, showing	  a	  top	  to	  the	  south	  sense	  of shear	  in	  the	  schist.	  The	  units	  present were	  determined	  to	  be	  Amphibole Gneiss,	  Amphibole	  Quartz	  Garnet Gneiss,	  and	  Garnet	  Schist	  as	  well	  as	  an un-­‐sampled	  Pegmatitic	  body.

Preliminary Characterization of Rock Units to Determine Layer Divisions in a High-Pressure Metamorphic Rock Package of the Goshen Dome, Western Massachusetts, USA