186 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 
The following bedded sandstones of the same region are also described: 
F. From middle fork of Cottonwood, 1 mile above Miller’s. 
G. Top of cascade, 14 miles up Byron Creek from north fork of Cottonwood. 
H. Two and one-half miles above John Allen’s, Dry Creek. 
Analyses F and G by Chatard, record No. 1106; H by Whitfield, record No. 974. 
3. SULPHUR BANK. 
Described by Becker in Mon. XIII, p. 92. Analysis made by Melville in the San 
Francisco laboratory. An altered sandstone, showing grains of quartz, plagioclase, 
and orthoclase. 
CHERT. 
From the lead-zine region of southwestern Missouri and its extension into Kansas. 
Collected by W. P. Jenney. 
. Unaltered chert, East Hollow, Belleville, Jasper County, Missouri. 
. Partly altered, same locality. 
. Altered to ‘‘cotton rock,’’ same locality. 
. From the Surprise mine, Joplin, Missouri. 
. Blue chert, unaltered, Bonanza shaft, Galena, Kansas. 
. Same locality. 
. Altered, same locality. 
. Jasperite, Joplin, Missouri. 
I. Jasperite, Galena, Kansas. 
Analyses A toG by E. A. Schneider, record No. 1205; H and I by L. G. Eakins, 
record No. 1208. 
HPOtrAyoOonmPT 
A B Cc. D E. F G H I 
NO dee cacenscranesnanearey sex 98.92 | 98.71 | 99.46 | 99.23 | 98.60 | 99.13 | 95.77 97.33 
Al:O3, Fe204 4 4 29 22 52 1 1.84 1.89 
COs aes 02 02 trace trace | trace 01 24 09 
CaO... 03 03 04 02 -10 | trace 54 ll 
Ignition 42 50 34 - 50 40 2 1.17 77 
99.87 | 99.69 | 100.13 | 99.97 | 99.62} 99.50] 99.56} 100.19 
