106 «J. M. Safford on Petroleum in Southern Kentucky. 
nessee line. The valley of the stream is, at the well, narrow, 
and is deeply set in the Cumberland table-land; it cuts through 
the Coal-measures and into the top part of the Mountain lime- 
voir of oil was struck, from which so much petroleum flowed as 
to lead to the abandonment of the boring asa salt well. For 
several years after petroleum was gathered at this point for me- 
dicinal pare How much petroleum issued from this boring 
it is now impossible to tell. I give it simply as a good exam- 
ple of an oil reservoir actually tapped in the Mountain limestone. 
2d. In the Siliceous group. ‘There are several examples in this 
formation of reservoirs reached by boring. At in the section 
the geological (not geographical) place of the “ Porter well” in 
Allen county, Kentucky, is represented. This well is located 
on Bay’s Fork of Big Barren, on a line between Scottsville and | 
Bowling Green, and “about seven miles from the former place { 
and eighteen from the latter. This reservoir was ta , some 
time in January of this year, at the moderate depth of 55 feet. 
It yielded for a number of days, by pumping, about 400 barrels 
of oil and strong brine per day, half of which was oil. At the ) 
time of my visit, Feb. 18th, it had produced altogether about 
1000 barrels of petroleum, but was not then doing well. 
In the southern part of Overton county, Tennessee, on Spring 
creek, is another example. Here a reservoir was struck which 
yielded heavy oil, but how much I am not informed. 
3d. In the Black Slate. On Boyd’s creek, near Glasgow, Ken- 
tucky, is a group of half a dozen wells or more. Their position 
is shown by the heavy vertical lines atc. One or two of these 
met with oil in the Black Slate. 
5th. In the Nashville group. This, group has furnished the 
most and the largest reservoirs. The geological and topograph- 
ical place of a number of borings, which have tapped oil reser- 
voirs, on the Cumberland and Obey rivers, and on their tributa- 
ries, both in Kentucky and Tennessee, is shown by the heavy 
