VERMONT. 
311 
mestone arc obtained here, one a cement rock, high in clayey matter, 
lie other a relatively pure limestone. These are mixed in proper 
proportion for Portland cement. 
Analyses of Portland cement materials used in Salt Luke City, Utah. 
lieu (Si0 2 ) 
jlun.ina (A1,0 3 ) 
[on Oxide (Fe 2 3 ) 
tme (CaO) 50. 96 
1 agnesia ( MgO) .58 
PORTLAND CEMENT RESOURCES OF VERMONT. 
Vermont, unlike the other New England States, contains extensive 
id important deposits of nonmagnesian limestones and marbles, 
hese deposits are worked at present for building stone and lime 
urning. 
The limestones quarried in Vermont fall into two distinct groups, 
lie first group contains the crystalline limestones (marbles), worked 
rtensively in the vicinity of Rutland, West Rutland, Dorset, and 
random The material obtained in this area is well known commer- 
ally as the u Vermont marble." The second group of limestones 
eludes those quarried in northwestern Vermont, the principal work- 
igs being near Swanton, Highgate Springs, Winooski, and Leicester 
unction. These limestones are mostly of Ordovician age (Chazy 
id Trenton), are not markedly crystalline, and commonly range in 
)lor from dark gray or blue to almost black. 
Both types — the marbles and the black limestones — are usually very 
>w in magnesia, as may be seen from the analyses below. 
Analyses of Vermont limestones. 
lica (Si0 2 ) 0.35 
lumina (Al.,0,) \\ 
; \\ .20 
*on oxide (Fe 2 3 ) ... > 
fee (CaO) 55.00 
[agnesia ( MgO) 25 
arbon dioxide (C0 2 ). 44.02 
0. 63 
{■:« 
53. 93 
1.47 
43.96 
0.63 0.40 
.05 
UO A 
34 7 
10 
55.09 155.83 
.37 ; Tr. 
43.68 43.65 
5 
6 
7 
8 
0. 28 0. 40 
0. 70 
| 
.30 .20 
.15 
lo. 22 
55.27 55.26 
55. 50 
55. 15 
.28 
.15 
Tr. 
.57 
43. 82 
43. 66 
43. 65 
44.00 
0.62 
54. 95 
.59 
43. 80 
1, 2. Proctor, Rutland County. Seventeenth Ann. Kept. I*. S. Geol. Survey, pt. 3, p. 809. 
3. Columbian Marble Company, Proctor. Penfield, analyst. Twentieth Ann. Kept. V. S. GeoU, 
irvey. pt. 6, p. 447. 
4. Felton Quarry, Highgate Springs. S. P. Sharpies, analyst. Twentieth Ann. Kept. U. S. Geol. 
Birvey, pt, 6, p. 4n6. 
■ r ), 6, 7. Vermont Marble Company, West Rutland. Seventeenth Ann. Rept. U. S. Geol. Survey, pt. 3, 
. sos. 
..*, 9, Vermont Marble Company, West Rutland. J. N. Harris, analyst. Seventeenth Ann. Rept. U.S. 
eol. survey, pt. 3, p. 808. 
