304 ASHLEY — GEOLOGY OF ARKANSAS. [May 13, 



FEET. 



{c, d) A bed of fine gravel (c) into which there run 

 thin layers (d') of sandy clay without gravel, the 

 fine gravel being the size of a pigeon's Q:gg and 

 smaller 4 



{e) Talus to level of road 2-4 



As the cut was but a few days old when noticed, it seems highly 

 probable that the red color at the top of (^) is due to the oxidation 

 of the iron, the color where freshly exposed being gray; the grada- 

 tion from the pure gray at the bottom to the deep red at the top 

 exhibits very nicely the process of oxidation. 



The relation of the bed of firm sand to the other beds of that 

 period is shown on Antoine creek in 8 S., 23 W. In section 14 it 

 forms a ten-foot bluff for a thousand feet, overlying two or three 

 feet of gravel. 



At the Antoine crossing of the military road to Fort Towsen and 



^^r-s-^TT^ Antoine , ^-.^i^fe^f^J-r ^drai" tji^i^- 



^ ^T:^s^ creek ^^r^a^ef-L "- " ^ T-Sia — — ffnrr- 



Fig. 37, Section at the crossing of the Fort Towsoa load and Antoine creek 



(8 S., 23 W., section 24). 



above, section 24, it appears again, Fig. 37 being a cross section at 

 that point. We have : 



FEET. 



(a) Bed of gravel dipping east or southeast and ly- 

 ing on a soft, friable sandstone dipping 45° south 8 



(^) Bed of firm sand with same dip 8 



{c) Outcrop on east bank of soft yellow or brown 



sandstone dipping 70° south, 25° west 3-5 



(d) Thin bed of novaculite gravel 2 



(^) Bed of very firm sand 8-10 



(/) Gravel ? 



The age of the sand in this case depends somewhat on the age of 

 the uppermost gravel, which is evidently the younger. But the 

 gravel on top may be a very recent deposit made by the creek. 



The beds of gravel attain no great thickness in the Paleozoic 



