ECKEL.] 
PORTLAND-CEMENT     RESOURCES    OF     NEW    YORK. 
525 
counties,  along  the  valleys  of  West  Canada  Creek  and  Black  River. 
Commencing  as  a  narrow  belt  near  Middleville,  Herkimer  County,  it 
passes  northwestward,  increasing  to  about  8  to  10  miles  in  width,  and 
going  through  Trenton  Falls,  Prospect,  Remsen,  Boonville,  Port  Ley- 
den,  Lowville,  and  Copenhagen,  at  many  of  which  points  it  is  exten- 
sively quarried.  The  limestone  belt  here  widens  out  greatly,  being 
about  20  miles  wide  at  Watertown,  and  extending  along  the  St. 
Lawrence-Lake  Ontario  shore  from  near  Clayton  to  near  Port 
Ontario,  a  distance  of  over  50  miles.  Within  this  broad  area  in 
Jefferson  County  the  Trenton  limestones  are  quarried  at  Cape  Vin- 
cent, Chaumont,  Clayton,  Watertown,  Theresa,  and  many  other 
points. 
COMPOSITION. 
The  Trenton  limestone  is  usually  a  pure  nonmagnesian  limestone. 
It  is  dark  gray  to  almost  black  in  color,  and  is  commonly  highly  fos- 
siliferous. 
The  following  analyses,  which  are  representative  of  the  various 
phases  of  the  Trenton  limestone,  are  arranged  in  geographic  order 
along  the  outcrop  of  that  limestone,  beginning  in  Washington  County, 
on  the  east,  and  ending  in  Lewis  County,  on  the  west. 
Analyses  of  Trenton  limestones,  Xrir   York. 
