GARLAND COUNTY. 
103 
These shales make a coarse but strong ware, the loss by firing and 
drying being about 2 per cent. If they were properly crushed, 
ground, and screened, there is little doubt that good, strong sewer 
pipe might be manufactured from them. 
GARLAND COUNTY. 
About Hot Springs are many beds of argillaceous shales, which in 
places are decayed to soft, plastic clays. At the spring just below the 
old Hale bathhouse some of these shales are light colored and have 
decayed to a buff or dirty cream-colored clay, while the darker shales 
form on decay a very black, sticky mud. 
Where the cut is made for the Government reservoir at the south 
side of the reservation, the rocks cut are black shales on the south and 
sandstones on the north. Both shales and sandstones are traversed 
by numerous quartz veins, and even where the shales have decayed 
and formed a soft, plastic clay broken quartz veins may be seen. 
These decomposed beds are injured for practical use by the presence 
of these small decayed quartz veins, which now remain as strings of 
angular quartz fragments. 
These shales belong with the overlying rocks and are well above 
the novaculites, which end with the Garland conglomerate bed shown 
in the quarries on both sides of the avenue above the Hotel Arlington. 
No clay industry of any kind is at present carried on in Garland 
County. 
A peculiar form of kaolinite to which the name rectorite a has been 
given is found in Garland County in sec. 27, T. 2 N., R. 19 W. This 
material is tough and leathery, but it has the smooth, soapy feel so 
characteristic of the kaolins and of steatite. It occurs in association 
with the Ordovician sandstones of the region, but the deposits, so 
far as known, are only about a foot thick. 
of rectorite from Garland County. 
[R. N. Brackett, analyst.] 
l. 
2. 
Silica (Si0 2 ) 
5'-'. 72 
36.60 
f .25 
.45 
I .51 
.26 
[ 2.83 
7.76 
52.88 
Alumina (A1 2 3 ) 
35.51 
Iron (Fe 2 3 ) 
Lime (CaO) 
Magnesia (MgO) 
Potash (K 2 0) 
Soda (Na 2 0) 
Loss on ignition 
(one determination) 
.25 
.45 
.51 
.26 
2.83 
7.72 
Water at 110° C. 
101.38 
8.78 
100. 41 
8.33 
Rectorite as it comes from the ground ranges in color from pure 
white to reddish brown. The sheets are very flexible but entirely 
o In honor of E. W. Rector, of Hot Springs, who originated the Geological Survey of Arkansas. 
