286 ASHLEY — GEOLOGY OF ARKANSAS. [May 13, 



all over the region, but there is an unusually fine example of them 

 in 5 S., 26 W., section 24, southeast quarter, where the edges of 

 the heavy layers having a dip of 25° are polished horizontally. 

 Such cases are common and are evidence of faulting, even though 

 no other testimony be obtained. In this case Self creek has fol- 

 lowed the fault and has been carried three-quarters of a mile east- 

 ward. 



In the same section, a little south of the centre, the rocks and 

 topography suggest an overturn with a strike of about S., 73° W. 

 In 5 S., 26 W., section 28, southwest quarter, on Rock creek in the 

 same strike, the rocks are sharply curved, and further west in sec- 

 tion 31, southwest of northwest, an anticlinal axis shows well on 

 Jhe east branch of the Little Missouri. The structure at this last 

 exposure is shown on the left of Fig. 30, the fault being introduced 

 to account for the sudden change of dip. 



In 5 S., 27 W., section 25, southwest of southeast, on the Little 

 Missouri river, a heavy mass of sandstone, showing no bedding and 

 of unknown extent, appears to have been forced up or down through 

 a thick exposure of thin-bedded shaly sandstone. The great 

 quantity of slickensides in every direction in it seems to preclude 

 the idea of its being an unconformity. 



The Structure in Township 6 South, 



Little Possum Creek Anticline. — In 6 S., 28 W., the Little 

 Possum creek axis is crossed by the Saline river in section 8, north- 

 west of the northwest. It isexposed next in 6 S., 30 W., forming a 

 ridge south of White Oak creek and showing well its structure at 

 ihe end of the ridge in the northwest of the northwest of section 

 10, and also in section 9, northwest quarter. In 6 S., 31 W., this 

 axis is followed by Little Possum creek. In 6 S., 32 W., it is 

 crossed by the Rolling Fork in section 12, northwest quarter. 



Galena Synclinal Axis. — Just south of the last described anti- 

 clinal axis and parallel to it are two other anticlines. The northern 

 one is crossed by the Saline river in 6 S., 28 W., section 8, south- 

 west of northwest, the other one is crossed by the same stream half 

 a mile further south. In 6 S., 29 W., only the southern one was 

 found, following the south section line of sections 10, 11 and 12. 

 Galena post-office is on the syncline between these two anticlines. 

 The two folds form a single flat-topped ridge which slopes off to 



