372 The American Geologist J"°«' ^^^^ 
Later drilling was continued through ''limestones of 
the same general character" to a depth approximating 3,000 
feet when the tools became fast, and hence work ceased. 
The 40 feet of sandstone found at a depth of 1,660 
feet has been reported in other places. Dr. Orton thought 
it the equivalent of the Sylvania sand found in Lucas 
■county. As is well known the latter formation lies in the 
Monroe formation, and hence cannot belong to the Orisk- 
any as some have thought. The sand is found at a corres- 
ponding horizon in the deep wells at Barberton, Summit 
county, Wayne county and at Jefferson, Ashtabula county, 
ft is this formation that contains the oil and gas at the 
latter place.* The presence of this stratum at widely dif- 
ferent places shows that it is more important stratigraphic- 
ally than has been heretofore recognized. 
Chemical analyses have been made from drillings taken 
at several horizons. These show that the shales associated 
with the rock-salt consist largely of calcium sulphate, and 
that the top of the Niagara is strongly magnesian and the 
lower part almost a pure dolomyte." 
Not finding the desired fuel in commercial quantities 
in this well, attention was given to the salt, with the result 
that the manufacture of this article was soon begun. The 
industrv has been extended to other places with the result 
that in 1903 Ohio produced nearly 15 per cent of the total 
for the United States, and again took third place, being 
surpassed by New York and Michigan only. 
Records of Other Wells. Shortly after the furnace 
was constructed at Newburg, one was built in Cleveland, 
the location being on the lake front at the foot of Madison 
street. Brine is supplied by five wells, each approximating 
2,000 feet in depth. Following is a log of well No. 4: 
Drift 267 ft. 
Ohio and Bedford shales ► 723 ft. 
Coniferous and Monroe formations 785 ft. 
• Geol. Survey of Ohio, Bull. I, 4th Ser. p. 33. 
t Geol. Survey of Ohio, Vol. vi. p. 354. 
