10 GEOLOGICAL SURVEY OF ALABAMA. 



marked, and distinctly prominent in the wider portions. It 

 may in descriptions hereafter be referred to as a trough, but 

 it must be remembered that it is a trough with a horizontal 

 bottom, and that bottom much nearer the northwestern 

 than the southeastern side. 



THE INTERIOR ANTICLINAL. 



Through the widest portion of this field, there is a well 

 defined anticlinal starting from near the southwestern end of 

 Greasy Cove and running west by south. It is about J of 

 a mile broad ; it does not make a ridge, but is plainly and 

 distinctly seen in the low lands where the streams have 

 eroded the strata. It is particularly noticeable where it 

 crosses Dearmond's Creek at the old Brasher Mill site, and 

 Sand Creek at the upper end of the old Holt place. Also 

 where it crosses Coal Bed Branch, and Difficulty Creek, to 

 the Blackburn Fork of the Little Warrior River in T. 14, 

 R. 1 east. Its course was traced about 10 miles, though it 

 probably extends much farther. Its dip on the south by 

 east and west by north sides is 10, but its top appears to 

 be unbroken. Its structure strongly suggests an underlying 



011 basin. And this suggestion is further strengthened by 

 the fact that near the eastern end of this anticlinal, beneath 

 the foot of the mountain a strong odor of escaping petroleum 

 is perceived, and the slates of the lower coal measures are 

 impregnated with oil, and burn freely in the fire. The un- 

 derlying Trenton Limestone carrying much carbonate of 

 magnesia is the great oil and gas producing rock the source 

 of the oil and gas in western Ohio, and eastern Indiana. 

 This rock is of that character in the valley to the west, 

 where it is largely exposed whether it is of this necessary 

 oil producing character beneath this anticlinal can only be 

 determined by the drill. This matter must be left for future 

 test and study. 



At present we are only calling attention to the structure 

 of this coal field, which has its symmetry in its widest por- 

 tion marred and broken by this uplift passing diagonally 

 through it. 



