1 ECKEL.] 
NEW YORK. 
345 
The following- analysis of the rock used by a natural-cement plant 
it Austin 1ms also been published. 
15. 59 
Analysis of natural cement rock from Austin, Minn. 
Silica (Si0 2 ) 
Alumina (A1 2 3 ) : 
Iron oxide (F 2 3 ) 2. 09 
Lime (CaO) 27. 55 
Magnesia (MgO) 13. 80 
Sulphur trioxide (SO.,) 06 
Carbon dioxide (C0 2 ) 36. 84 
NATURAL-CEMENT RESOURCES OF NEW YORK. 
In the Sta^e of New York natural cement is now manufactured in 
four distinct localities. These are, in order of importance, (1) the 
Rosendale district in Ulster County, (2) the Akron- Buffalo district in 
Erie County, (3) the Fayetteville-Manlius district, mostly in Onon- 
daga County, and (4) Howes Cave, in Schoharie County. 
The clayey limestones used in these four districts occur in three 
different but closely related geological formations, all in the Upper 
Silurian group. The sequence and relation of these formations, from 
the top downward, is shown in the following table: 
Formation. 
Ulster County. 
Schoharie 
County. 
Onondaga 
County. 
Erie County. 
Manlius limestone 
Worked for 
cement at 
Manlius, 
etc. 
Absent. 
(cement rock). 
Rondout limestone 
Upper cement 
bed of the 
Rosendale 
district. 
Worked for 
cement at 
Howes 
Cave. 
Absent. 
(cement rock). 
Cobleskill limestone 
(not used for ce- 
ment). 
Bertie limestone (ce- 
Lower cement 
bed of the 
Rosendale 
district. 
Present in 
Onondaga 
County but 
rarely used 
for cement. 
Worked for 
ment rock). 
cement at 
Akron and 
Buffalo. 
For convenience, these districts will be described not in the order of 
their relative importance, but in geographic order, from east to west. 
ROS'K N I ) A LE I > I STRICT. 
Rosendale district lies entirely in Ulster County, the principal 
cement-rock quarries being located at East Kingston, Rondout, Rosen- 
dale, Burnewater, Laurenceville, and High Falls. Two distinct beds 
