ARKANSAS. 
97 
foestone occur it is comparatively pure carbonate of Lime. Some 
pdules or lenticular masses of chert occur in the heavy beds of lime- 
one, but in no instance was there any considerable quantity of silica 
kund diffused through the bed of limestone. The whole series, in 
Let, might be divided into (1) chert almost free from lime, (2) calcare- 
Ls chert or siliceous limestone, and (3) comparatively pure limestone. 
Analyse* of limestones from the Boone chert. 
me (CaO) 
agnesia ( MgO ) 
ica (SiO,) 
umina (A1 2 3 ) 
n oxide (Fe 2 3 ) 
tash (K 2 0) 
da (Na 2 0) 
isphoric acid (P 2 3 ) 
m on ignition, C0 2 and organic matter 
Total 
§er at 100°-115° C 
rbonate of lime (CaC0 3 ) 
55.17 
Trace. 
1.61 
.00 
.14 
.14 
.09 
.10 
4:;. L3 
100. 38 
.057 
98.29 
2 
55. 42 
.39 
.68 
.00 
.32 
.19 
.19 
.17 
43. 56 
100. 92 
.09 
98. 59 
56.14 
Trace. 
. 30 
.00 
.06 
.12 
.08 
Trace. 
43.77 
100. 47 
.49 
100.2:; 
Allen's quarry, Polk Bayou, sec. 4, T. 13 N., R. 6 W 
Near Victor post-office, sec. 10, T. 13 N., R. 7 W. 
Mill Creek, sec. 13, T. 16 N., R. 18 W. 
Partial analyses of limestone from the Boone chert. 
l 
2 
:{ 
4 
5 
fi 
7 
me (CaO) 
54.92 
1.47 
53. 66 
4.38 
55. 06 
54.89 
55.09 
.50 
56.15 
.19 
55. 12 
soluble (silica ) 
.28 
ignesia ( MgO) 
.03 
.21 
.45 
iss on ignition (C0 2 , etc.) .. 
43.61 
43.58 
Total 
56.39 
.10 
98.07 
58.04 
.31 
95. 82 
55. 09 
55.10 
99.20 
.03 
98. 37 
99. 92 
100. 25 
55.85 
ater at 110-115° C 
Iciuin carbonate (CaC0 3 ) .. 
agnesium carbonate 
(MgC0 3 ) 
98.32 
98.02 
98.43 
95 
Loster's spring. 
Jones quarry. 
Pond Mountain, sec. 23, T. 20 N., R. 26 W. 
Limekiln at Rogers 
Brush Creek, Madison County, sec. 25, T. 17 N., R. 28 W. 
Sec. 15, T. 17N.,R. 26 W. 
Denieville, Independence County. 
Bull. 243—05 7 
