24:0 ASHLEY — GEOLOGY OF A EKANSAS. [May 13, 



where the river turns east and northeast. The dip is low, from io° 

 to 20°. At the north foot of Pine mountain a bed of shale is 

 exposed, then for a short distance it is concealed beneath broken 

 sandstone blocks. Near the top of the mountain on the north side 

 in this area of no outcrops were found many pieces of grit or con- 

 glomerate, indicating its presence there in place. Massive layers 

 of sandstone, twenty to forty feet thick, form the top and south slope, 

 dipping 20° south. For most of the rest of the distance the sand- 

 stone is exposed almost continuously in low, perpendicular cliffs, the 

 dip being very low. This is thought to be a single outcrop to the 

 centre of section 31 in the next township east. This cross-section 

 and the preceding are separated only by a short stretch in which 

 there are no exposures. The dip is the same, and it is possible that 

 the two are part of one section; many things, however, point to its 

 being a repetition of the preceding section, and the topography 

 also is suggestive of a fault between the two. 

 The section gives : 



FEET. 



Sandstone 400 



Concealed 100 



Sandstone 900 



Concealed 115 



Shale 30 



Total 1545 



Section VII. — Section vii, at Caddo Gap, is quoted from Mr. 

 Griswold.^ 



It is as follows : 



FEET. 



Sandstone 980 



Sandstone with some shale 200 



Silurian novaculites, etc base 



Thickness of the Carboniferous beds 1 180 



Section VIII — Section viii is on Caddo river, in 5 S., 21 W., sec- 

 tion 27. A long stretch of low dip (from 5° to 10°) with continu- 

 ous outcrops gives this section : 



1 Geol. Surv. of Ark., An. Rep, for 1890, Vol. iii, PI. iii. 



