78 GEOLOGICAL RECONNOISSANCE. 
calcareous bands locally interstratified amongst the layers, exposed in the 
north-east bank of that stream. 
At the crossing of a branch, five miles south-east of Burrowsville, the 
subcarboniferous limestones alternate with sandstone and grey fossilifer- 
ous shale, underlaid by some 50 feet of flaggy sandstone, resting on the 
dark halen which crop out about half a mile down the branch to the left 
of the road. The gray fossiliferous shale, to the right of the road, lies 
about 85 feet above the base of the flaggy sandstones; above this are 
alternations of sandstone and grey limestones, while on the slope of the 
adjacent hillsides, gravel of black flinty chert is everywhere strewed. 
Four, to four and a half miles south-east of Burrowsville, the sandstone 
overlying the black shale has a disposition to split into rectangular, pris- 
matic blocks. 
At Burrowsville, the present county-seat of Searcy county, there is'a 
buff, flaggy sandstone, which is quite fossiliferous; some of the layers are 
charged with casts of Producta. The rock has been quarried to a limited 
extent, in the immediate vicinity of Burrowsville, and has been used for 
foundations and underpinning to buildings, and in the construction of 
chimneys. 
North-west of Burrowsville, the black shale was not seen; the descent 
from the productal flags leads immediately on to chert and light-grey 
subcarboniferous limestone; unless, therefore, the black shale is entirely 
concealed from view, the productal flags of Burrowsville must underlie 
the black shale, so frequently exposed in Wiley’s cove, and between that 
and Burrowsville. A black slate is said to be exposed in a ridge west of 
Lebanon, where there is an extensive lick; this locality, I have not yet 
had an opportunity of examining. 
In the vicinity of Lebanon, on the north bank of Bear creek, are 
perpendicular cliffs of cherty, subcarboniferous limestone; one bed of 
which is nearly white, and of a texture passing from pranlar into sub- 
crystalline, with large Spirifers, allied to, but probably distinct from 
Spirifer striatus, which occurs in the same position on the Rapids of the 
Mississippi, above the mouth of the Des Moines, under the Archimedes 
beds, and above the Keokuk cherty limestone containing Orthis erenis- 
tria, which is superimposed on the encrinital beds of Burlington. 210 
feet of these cherty members of the subcarboniferous limestone is exposed 
on Bear creek; above the principal escarpment there is a slope of 100 feet 
more, where gril loose pieces of chert:are visible amongst the vegetation. 
At the next crossing of Bear creek, vertical walls of cherty limestone 
are again seen, where they dip 4 deg. to 5 deg. south-west. Here the 
