KEL.J ARKANSAS. 107 
ove that at the railroad, making the whole section of rock exposed 
this place nearly 40 feet. Very little change in the nature of the 
k could be noted in this section. 
Analysis 16 is of the fresh chalk rock near the center of the middle 
ii(t, from the lower and more chalky part of the formation, and shows 
iot at this marl contains less than one-half the amount of silica found in 
i8|e blue marl 10 feet below, though in physical appearance it is more 
ndv. 
One- half mile south of the middle cut and a few hundred feet north 
the south cut the top of the Saratoga marl is exposed in a ditch at 
d railroad. The sandy marl in this exposure is but little above the 
allsy marl at the top of the exposure opposite the middle cut. It 
Ijj massive, dull blue, and very sandy, approaching a sandstone in 
Imposition. 
The south cut, which is about 2 miles north of the town of Wash- 
gton, is in the lower part of the greensand marl which overlies the 
oia-atoga formation. This cut is about 30 feet deep and about 300 
et long. From the surface downward about 20 feet the greensand is 
o gathered from dark blue or greenish blue to shades of dull brownish 
'How. Unaltered marl was collected from near the base of the cut, 
d its composition is shown in analysis 17. Physically it is very 
ndy, and the analysis shows that it contains 75.77 per cent of silica 
id 5.72 per cent of lime. Similar greensand marl occurs between 
is cut and Washington, and its thickness is estimated to be more 
an 100 feet. 
From the railroad eastward to the end of the formation in this area, 
sec. 29, T. 10 S., R. 21 W., the Saratoga chalk crops in an irregu- 
r belt one-half to three-fourths mile wide, making an intermediate 
)land, marked by projecting ridges and spurs between the high tim- 
jred greensand country on the south and the flat black land of the 
ay marls bordering Ozan Creek bottom on the north. 
OKOLONA AREA. 
This area is in the southwestern part of Clark County, south and 
,st of Okolona, between the bottom lands of Antoine and Terre Noire 
eeks. 
The Saratoga chalky beds at the crest of the ridge south of Okolona 
•e 50 to 150 feet above the lowland to the west and south. The crest 
this ridge slopes southward with the dip of the rock, which is nearly 
) feet per mile. 
East of Okolona the chalky marl forms a triangular area of rolling 
)land about 3 square miles in extent. 
The stream which rises in the southwest part of the town and flows 
mtheastward past the railroad station separates the area south of the 
>wn from thai east of it. It is probable that these two areas are 
