|cKEL.j ARKANSAS. 101 
•lav. The only perceptible physical difference, however, is that it is si 
ittle harder. 
A rather large exposure of white chalk, of beds near the top of the 
formation, appears on Col. Henry Hawkins's place, in the NW. i 
sec. 33. About one-fourth mile southeast of the house, in the SE. \ 
of NW. \ sec. 33, the top of the true chalk and the base of the succ- 
eeding chalk} 7 marl is exposed. A thin mantle of gravel conceals 
part of both the chalk and the marl. The upper layers of the chalk 
are also exposed south of the branch, in the SE. \ sec. 28. 
There are smaller exposures of chalk in this region, but it is believed 
hat those above described are typical. 
WHITECLIFFS AREA. 
The chalk here exposed occupies parts of sees. 25, 26, 35, and 36, 
L\ 11 S., R. 29 W., and sees. 30 and 31, T. 11 8., R. 28 W., and 
covers an area of about 600 acres. 
A large part of the chalk of the Whitecliffs area is covered by a thin 
nantle of gravel and sand. In places this gravel may attain a thick- 
ness of several feet, but it is believed that it will nowhere interfere 
seriously with the removal of the chalk. The chalk is also concealed 
n places, especially near the border of the the area, by its own resid- 
al soil, with scattered pebbles or a very thin la3 7 er of gravel. 
The most noteworthy exposure of chalk in southwestern Arkansas 
occurs in the cliffs overlooking Little River from the east side, in the 
ortheast corner of sec. 35, T. 11 S., R. 29 W., immediately above the 
! erry. 
From the brink of the cliff down to the water level is 115 feet, and 
ibout 15 feet of chalk is exposed at a higher level by the road which 
eads from the cement works. The following is a detailed section, 
beginning at the top of the chalk and marl in the cliff: 
Section at Whitecliffs Landing. 
Feet. 
. Massive, creamy white chalk, in beds from a foot to about 10 feet thick, sep- 
arated by thin partings of very slightly laminated chalk. The variation 
in the character of the chalk from bed to bed is not perceptible on physical 
examination, and the stratification planes are not clearly defined except 
upon partial weathering of the rock. Analysis No. 7 (p. Ill ) is of specimens 
in the lower part of this chalk, while No. 9 is an average of specimens from 
each bed in the lower half as exposed in the quarry. No. 8 is from about 
10 feet below the top as exposed by the road opposite the cliff 60 
!. Massive dull bluish-white siliceous chalk. Slightly harder than the pure 
chalk of 1, practically without indication of bedding, and because of its 
hardness projects in a steep bench overhanging the less chalky beds 
below. Analysis No. 6 shows that this chalk contains nearly twice as 
much silica as the chalk above. This bed occurs in the bench beneath 
the quarry and passes to the level of the river bottom near the cjay pit 
south of the works. An outcrop occurs also near the middle of the bluffs 
north of the cliffs, spreading out at the surface in the cultivated fields 1 
mile southeast of the village of Whitecliffs 25 
