3g GEOLOGICAL RECONNOISSANCE 



spicuous hill of upwards of 500 feet, which forms a bold headland on the 

 south side of White river, about 5 miles above Batesville, known as 

 " Shield's Bluff," or White river mountain. It seems to be the most ele- 

 vated part of a ridge which runs off to the south, forming a kind of geo- 

 logical culminating axis on its summit, whence the strata dip both to the 

 south-west and north-east. 



In this bluff I found the Archimedes limestone again, but in a much 

 more elevated position than in the Oil-trough ridge, being 350 feet above 

 the Dean farm, and some 400 feet above White river. 



The total height of Shields' bluff is about 570 to 580 feet above White 

 river. The lower 50 or 60 feet above the Dean farm is dark calcareous 

 shale and shaly limestones; above which are some 330 to 340 feet of grey 

 and bluish limestones with some alternations of sandstone; the summit 

 being capped with from 80 to 100 feet of sandstone, occupying the place 

 of the millstone grit and conglomerates that intervene between the Archi- 

 medes limestones and the coal measures. 



The following are the elevations of the principal members of the sub- 

 carboniferous group observed in Shields' bluff above the Dean farm: 

 At 520 feet, Top of escarpment of sandstone, capping the ridge. 



« 475 " Foot of do. 



« 395 " Ledge of sandstone. 



" 385 " Limestone. 



" 350 " Archimedes limestone. 



" 345 " Encrinital limestone. 



" 340 " Ledge of sandstone. 



" 325 " Grey limestone. 



" 315 " Sandstone (in place?) 



" 300 " Top of ledges of limestone. 



" 200 " Grey limestone. 



« 170 " Off-set of hill-side with black limestone. 



« 145 " Black limestone. 



" 120 " 3d bench of limestone. 



» 100 " 2d bench of limestone. 



" 55 " 1st bench of limestone. 



Limestone shales and shaly limestone at the foot of the hili 

 down to the Dean farm. 

 Shield's bluff, where this approximate section was obtained, is a noted 



land-mark in Arkansas, as having been the point where the old Cherokee 



line commenced at White river, and ran south-west along the dividing 

 ridge, of which it forms the terminating bluff on White river. 



Eight miles south-east of Batesville, on the north-side of White river, I 



