MINERAL PRODUCTS. 
39 
In Arkansas flint pebbles have been noted at many places in 
Greene, Craighead, Poinsett, Cross, and St. Francis counties, along 
Crowleys Bulge, which is paralleled by the St. Louis, Iron Mountain 
& Southern Kailway. From 4 to T miles west of Paragould, in 
Greene County, where a public road crosses the highest part of the 
ridge, beds of gravel not exceeding 5 feet in thickness occur, usually 
overlain by 1 to 5 feet of loam. The gravels consist chiefly of gray, 
brown, and pink angular or fairly well-rounded pebbles of flint and 
chert, the largest 6 inches in length, and a considerable percentage of 
white, partly rounded to smoothly rounded pebbles of quartz, the 
largest 1 inch in length. An exposure on the property of Mrs. 
Mahala Shelton, 6 miles southwest of Jonesboro, in Craighead 
County, on the south side of one of the small headwater streams of 
L’Anguille Biver, shows from 4 to 11 feet of gravel, consisting 
mainly of angular to party water-worn brown chert pebbles and 
cobbles, reaching a maximum dimension of 1 foot. Bed, pink, gray, 
and black chert pebbles and a few smoothly rounded pebbles of pink 
and white quartz were also observed. Excavation for road material 
1 mile east of Wynne, in Cross County, just south of the St. Louis, 
Iron Mountain & Southern Kailway, showed 16 feet of gravel, con 
sisting chiefly of angular to fairly well rounded pebbles and cobbles 
of brown and gray flint and chert as much as 6 inches in length, with 
some well-rounded quartz pebbles, lying in a matrix of coarse red 
dish sand. This material is covered by about 10 feet of loam. 
In northeastern Mississippi gravels carrying abundant flint peb 
bles have been noted in Tishomingo County, a locality about 2% to 
3 miles east of Iuka being especially mentioned. Some of these de 
posits are 50 to T5 feet thick and cover large areas. The flints are 
only in part well rounded and portions of the deposit are iron 
stained. The gravel is extensively excavated for use in road making. 
In Texas light opalescent to black flint pebbles are abundant at 
several localities. They are well exposed along the river bluffs near 
Austin, Travis County, where they have weathered out of the lime 
stone. They also occur along Nueces Biver near Oakville, in Live 
Oak County, and over large areas near Tilden, in McMullen County. 
Only here and there are these flints well rounded, and many of them 
are coated with a thin film of iron oxide. 
For certain kinds of tube mill grinding—as, for example, the 
grinding of feldspar or of crystalline quartz for making pottery— 
pebbles practically free from any iron-bearing mineral must be 
used, for even small specks of iron-bearing minerals produce stains 
in pottery on firing. For other purposes, however, as, for example, 
the grinding of gold ores preparatory to cyanidation, the same free 
dom from iron is not necessary, and rounded pebbles of various kinds 
of hard rocks collected from benches, stream beds, or gravel deposits