OF ARKANSAS. 79 



white Spirifer bed was found in place 90 feet below the top of the ridge 

 dividing the waters of Bear creek from those of the Buffalo fork of White 

 river; which is 360 feet above that stream. 



In this ridge, 30 feet of sandstone was found overlying cherty limestones 

 of the same character, and, no doubt, a continuation of the limestones 

 forming the Bear creek cliffs. 



Greyish-pink beds of this limestone extend down to the water's edge, on 

 the north-east side of the Buffalo fork, just above the ford on the road to 

 Carrollton. 



At Spencer Adams's a Spirifer, allied to the cuspidatus, occurs in the 

 sandstone, at an elevation of about 360 feet above the bed of the Buffalo 

 fork. 



No black shale was observed, in any of the sections exposed on the 

 streams, in this part of Searcy county. 



A few hundred yards, on the north-west side of Mill creek, an abrupt 

 dislocation has fractured the strata and thrust up the beds of limestone ; 

 which may be traced, ascending the hillside, on the north side of the road^ 

 with abrupt mural faces, resembling. a dyke of basalt. 



Some lead ore has been obtained in the crevices of the subcarboniferous 

 limestone along this axis of disturbance, and some shallow excavations 

 have been made ; but these did not yield ore sufficient to encourage further 

 search. 



The occurrence of this ore, adjacent to the axis of disturbance above- 

 mentioned, is, however, a favorable indication for the discovery of a regu- 

 lar lode, and more thorough and deeper explorations might lead to better 

 discoveries. 



Where the Carrollton road ascends the hill, about a mile further, the 

 following section is exposed : 



Slope, with carboniferous chert gravel. 



White limestone, about 20 feet. 



Encrinital limestone, 30 feet. 



Eed and pink limestones, or marble rock, 15 feet. 



Vein of ore containing iron and manganese ? 



Coarse-textured limestone. 



Variegated white and pink beds, some of the lower layers of which, 

 for 40 to 50 feet, have a structure similar to that of lithographic lime- 

 stone. 



The strata exposed below the chert slope, amount in all to about 120 

 feet The summit of the ridge passed over is 470 feet above Mill creek, 

 but in the 300 feet above the base of the chert slope, little else can be 

 seen but gravel of this material. 



