276 ASHLEY — GEOLOGY OF ARKANSAS. (May 1:5, 



on a small scale. In several places, where the heavy layers of sand- 

 stone are perpendicular at their outcrops, the topography is charac- 

 terized by these irregular parallel walls, from two or three to ten 

 feet high, running as far as the eye can reach. 



Suck Creek Ove7'iurn. — The Suck creek overturn was only seen 

 in 8 vS., 23 W., first showing on a small creek in the southeast 

 quarter of section 13. It is crossed by Antoine creek near the 

 mouth of Suck creek in the southwest quarter of section 11, show- 

 ing nicely in a small exposure on the east bank. It was traced up 

 Suck creek about two miles \ it appears to be an overturn all the 

 way. Its strike is N., 65° W. 



Other Anticlines. — The structure of the Chalybeate mountain 

 was not solved, but the evidence suggests that it is an underthrown 

 syncline, with the Caddo river anticline on one side, and on the 

 south side an anticline of which no trace was found, unless there 

 could be considered as such, perpendicular dips in 6 S., 22 W., 

 section 13, near where the old Camden road leaves the Arkadel- 

 phia-Mount Ida road, or an exposure of shales apparently in the 

 axis of an overturn in 6 S., 20 W., northern part of section 26, on 

 the Caddo. 



In 7 S., 21 W., section 10, an anticline is crossed by a tributary 

 of Winfred creek in the northern part of the section, and another 

 is crossed by Winfred creek in the southwest quarter. These have 

 a strike of S., 65° W. In section 6 an anticline is crossed by 

 Bell's creek in the southwest corner of the section with an east and 

 west strike. 



In 6 S., 22 W., section 36, an anticline was found at the end of 

 a ridge; it probably continues to the Terre Noir, forming a ridge 

 which runs a little south of west. 



In 6 S., 23 W., there is an anticline or overturn just at the south 

 township line in section 34 on the Antoine. It may be the cause 

 of the valley of White Oak creek. 



In 7 S., 23 W., it is probable that there is an anticline in the 

 east and west valley running through the centre of sections 12, 11, 

 10, etc. Traces of manganese found near Story's store, section 10, 

 southeast quarter, tend to confirm this supposition. In the centre 

 of the township the strata for several square miles are so nearly 

 perpendicular that a variation of a very {t\N degrees gives the 

 appearance of an anticline, so that it is impossible to tell which are 

 anticlines and which are not. In section 22 is a large, flat area, 



