kkl 1 ARKANSAS. 109 
Following is a section of Saratoga chalk-marl at Dobyville: 
t|j Section at Dobyville. 
Feet. 
( i ravel, reddish and yellow stratiiied clays 20 
Blue marl 15 
Dull-bluish chalky marl 35 
This marl is slightly indurated at the top and contains numerous casts 
of bivalve shells and gastropods. It is a calcareous sandstone at the top. 
The beds become more chalky downward, until the lower part of the 
chalky marl is found to be the same in nature as that described as occur- 
ring sonth of Okolona and in the Washington area. 
Even-textured chalk-marl, with Gryphxa vesicularis shells at the base 15 
This member contains more chalk than those above and has finer tex- 
ture. In places, also, very fine particles of greensand were noted dissem- 
inated through the marl. 
Fine-textured blue clay marl. 
This is the upper part of the 150 to 200 feet of blue marl which lies 
between the Whitecliffs chalk formation and the Saratoga chalk-marl. 
From the vicinity of Okolona eastward, the outcrop of the Saratoga 
irl descends gradually from the brink of the escarpment to the level 
the river bottom, nearly 2 miles east of Dobyville. 
DECIPER AREA. 
The next known occurrence of the Saratoga chalk-marl east of Oko- 
na is on Big Deciper and Little Deciper creeks, 3 to 5 miles west of 
rkadelphia. 
The occurrence of the Saratoga chalk on the Deciper creeks is 
nfined to outcrops in the middle and lower slopes of the valley near 
e Arkadelphia-Dobyville and Arkadelphia-Hollywood roads. The 
ineral location of the outcrop is shown in PI. III. 
Near the center of sec. 28, T. 7 S., R. 20 W., on the Bozeman place, 
le-third of a mile northeast of the house, about 30 feet of the Saratoga 
alk-marl is exposed, as follows: 
Section of the Saratoga chalk-marl at the Bozeman place, beginning at the base. 
Sandy soil to the top of the ridge. Feet. 
Chalky marl, more sandy than that of 3 10-1 5 
The sandy element in this marl increases in quantity upward. 
Even-textured blue chalk-marl 15 
This clalk contains a sprinkling of fine greensand, and in all respects 
is the same as the lower 15 feet of the formation at Dobyville and Okolona. 
Analysis No. 24 shows that this marl contains about 30 per cent of sand 
and 61 per cent of chalk. 
(iri/ph sea vesicularis shell marl 1-2 
The limits of this shell bed are not sharply marked. Through 1 to 2 
feet of the marl at the base the shells are abundant, and in it is a thin 
layer of shells indurated by calcareous matrix. 
The blue marl from the Gryphxa vesicularis shell bed downward; exposed . 15 
