108 CEMENT MATERIALS AND INDUSTRY. [bull. 2. 
connected by narrow bands of outcropping* marl which extend do? 
the sides of the valley about 2 miles southeast of the village. 
The Saratoga chalk-marl is partially exposed near the crest of t. 
escarpment north of the Okolona-Dobyville road, from the east si< 
of sec. 30, T. 8 S., R. 21 W., to the edge of the Terre Noire bottoi 
li miles east of Dobyville. 
The Saratoga marl, near the middle of the formation, is well exposi 
toward the top of the ridge at the forks of the road, 1^ miles south 
Okolona. In physical appearance this rock is the same as that at til 
middle of the formation in the vicinity of Washington. It is massi 
and dull blue on fresh exposure and weathers to shades of drab < 
light yellow. Analysis 19, page 111, shows that the chalk-marl in tb 
locality contains nearly 13 per cent of silica and 19 per cent of calciu 
earbonate. 
Two and one-half miles south of Okolona and one-fourth of a mii 
west of the road, on the Mat Hardin place, deep gullies expose- tl 
lower 20 feet of the Saratoga marl as well as the blue marl belo> 
The Gryphaea vesicularis bed is well marked, but the fossils are a litt 
less abundant than in the Washington area, 20 miles farther west, 
the lower 10 feet of the formation the chalk-marl is finer in textu 
and more chalky than in the higher beds. The result of an anal yi\ 
of chalk from this place is given as No. 21, page 111, and shows th 
the amount of silica is nearly 10 per cent less than in the marl ne; 
the middle of the formation. 
Numerous other exposures of the lower part of the formation occt 
in the gullies and slopes of the hill on the west side of the ridge, whl 
the land was once cultivated. The top of the Saratoga marl pass 
beneath the bottom land of Little Missouri River, about 3 miles sou 
of Okolona. 
Five miles south of Okolona the greensand marl, which beloa 
above the Saratoga chalk, forms the bluffs from the level of the Litt 
Missouri bottom up to the top of the ridge. This is the greensan 
formation which occurs between Washington and the Saratoga eha 
in Hempstead County. 
About 20 feet of the middle portion of the formation is exposed 
the.Okolona-Garden road, 1 mile east of Okolona. 
In the high rolling country east of Okolona the Saratoga cha|l 
marl is generally concealed beneath its own soil or beneath sand 
Neocene age. 
The lower beds of the chalk outcrop in the Okolona-Dobyville ro 
2 miles west of Dobyville, and at several other places in the top of 
escarpment between Okolona and Dobyville. 
One-fourth of a mile north of Joseph Doby's house, at Dobyvill 
the full section of the Saratoga chalk-marl is exposed in an old held. 
