CCKEL.] 
PORTLAND-CEMENT    RESOURCES    OF     NEW    YORK. 
529 
COMPOSITION. 
The  Tully  limestone  is  low  in  magnesia,  rarely  carrying  over  1J 
per  cent  of  magnesium  carbonate.  It  commonly  carries  a  rather  large 
percentage  of  silica,  alumina,  and  iron  oxide,  at  times  approximating 
to  the  composition  of  Lehigh  cement  rock.  The  analyses  given  below 
are  fairly  representative  of  its  range  in  composition. 
The  limestone  is  immediately  underlain  by  a  series  of  shales  which, 
as  shown  by  the  experience  of  the  Portland-cement  plant  near  Ithaca, 
are  well  adapted  to  mixing  with  the  limestone. 
Analyses  of  Tully  limestone,  New  York. 
Silica  (Si02) 
Alumina  (ALOs) 
Iron  oxide  (Fe203) . . . 
Lime  (CaO) ... 
Magnesia  (MgO) 
Carbon  dioxide  (C02) 
1. 
2. 
3. 
4. 
5. 
9.72 
6.80 
7.88 
5.7 
4.0 
4.20 
.48 
1  3.35 
4. 01 
2.1 
26.0 
47.11 
50.25 
48. 10 
49. 56 
33.6 
.66 
.  22 
.  53 
.67 
2.  6 
n.d. 
n.d. 
n.d. 
39.  67 
n.d. 
15.0 
23.0 
30.0 
1.3 
n.d. 
1.  Top  bed.      Portland  Point,  Tompkins  County.      J.  II.  McGuire,  analyst. 
2.  Middle  bed.      Portland  Point,  Tompkins  County.      .1.  IT.  McGuire,  analyst. 
3.  Bottom  bed.      Portland  Point,  Tompkins  County.     J.  II.  McGuire,  analyst. 
4.  Near  Lansing,  Tompkins  County.  H.  Ries,  analyst.  Pull.  New  York  State  Mus.  No. 
44,  p.  820. 
5.  Willard,  Seneca  County.     Trans.  New  York  Agric.  Soc.  for  1850,  p.  611. 
6.  Hayt  Corners,  Seneca  County.      Ibid. 
QUATERNARY    MARLS. 
DISTRIBUTION. 
Small  deposits  of  marl  occur  at  many  points  in  eastern  and  north- 
ern New  York,  filling  old  lake  basins  and  now  forming  swampy 
tracts,  overlain  by  much  impure  peat.  So  far  as  known,  none  of  the 
deposits  in  this  part  of  the  State  are  of  workable  size. 
In  western  and  central  New  York,  however,  large  marl  deposits 
Shave  been  found  at  many  points.  They  are,  or  have  been,  utilized 
in  the  manufacture  of  Portland  cement  at  Montezuma,  Cayuga 
County;  Jordan  and  Warners,  Onondaga  County;  Caledonia,  Gene- 
see County;  Wayland  and  Perkinsville,  Steuben  County,  and  Cas- 
sadaga  Lake,  Chautauqua  County.  Other  large  deposits,  as  yet  unde- 
veloped, occur  northwest  of  Canastota,  Oneida  County;  at  Cortland, 
jCortland  County;  Clifton  Springs,  Ontario  County;  Clarendon, 
Orleans  County,  and  Bergen,  Genesee  County.a 
Bull.  2<;o- 
«  Bull.  New  York  State  Mus.  No.  44,  p.  707. 
-05  m 34 
