I'HE  GRANITE  INDUSTRY  OF  THE  PENOBSCOT  BAY  QUAD- 
RANGLE, MAINE. 
By  George  Otis  Smith. 
Introduction. — Maine  stands  first  in  the  list  of  granite-producing 
States.  By  the  statistics  for  L903,  compiled  by  the  division  of  min- 
eral resources,  Massachusetts  appears  to  lead  Maine  slightly,  but 
the  figures  for  the  granite  output  of  Massachusetts  include  the  value 
of  trap  rock  quarried  in  large  amounts  for  road  metal  and  railroad 
ballast,  whereas  Maine's  production  is  almost  wholly  true  granite. 
Thus  in  value  of  granite  production,  Maine  leads  by  about  $225,000. 
Of  the  total  output  of  the  State,  valued  at  $2,586,765  in  L903,  approxi- 
mately one-half  is  the  product  of  the  quarries  included  within  the 
Penobscot  Bay  quadrangle.  This  production  of  nearly  $1,250,000 
annually  makes  the  granite  industry  of  this  area  of  considerable 
importance,  and  the  geologic  and  economic  survey  of  the  quadrangle 
has  furnished  interesting  data  upon  this  subject. 
Areal  distribution. — The  granite  is  distributed  over  the  larger 
part  of  the  land  area  included  within  the  Penobscot  Bay  quad- 
rangle and  occurs  in  three  principal  areas  aggregating  over  100 
square  miles.  One  of  these  extends  northward  from  Bluehill  Har- 
bor, another  northward  from  the  shore  of  Kggemoggin  Beach 
through  the  towns  of  Sedgwick,  Brooksville,  and  Penobscot,  while 
the  third  belt  extends  from  the  southern  part  of  Brooklin  south- 
westerly across  Deer  Isle  to  Yinalhaven.  This  belt  is  the  most 
important,  including  as  it  does  the  Stonington,  Crotch  Island,  Yinal- 
haven, and  Hurricane  Island  quarries.  The  situation  of  these 
quarries  and  others  located  on  Bluehill  Harbor  and  Eggemoggin 
Reach  constitutes  the  most  important  natural  advantages  of  (he 
Penobscot  Bay  granite  district.  Deep-water  channels  suitable  for 
the  largest  coasting  vessels  extend  to  the  very  oi\<xv  of  the  quarries, 
so  that  the  largest  blocks  of  granite  can  be  loaded  directly  upon  the 
vessels  which  are  to  take  them  to  the  large  cities  of  the  Atlantic 
coast.     Thus  the  cost  of  transportation  is  reduced  to  a  minimum. 
Description  of  the  rock. — The  granite  of  this  region  varies  some- 
what both  in  texture  and  in  color.     In  general  it   is  of  a   light  -gray 
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