18 BEREA GRIT OIL SAND IN CADIZ QUADRANGLE, OHIO. [bull. 198. 
In selecting the measurements for determining the vertical distance 
between these different striata, only those were used which were 
obtained where the formations were known to be lying nearly level, 
or where the horizontal distance between the two outcrops was small. 
In cases where two outcrops of the same bed could be obtained and 
the outcrop of another stratum was found approximately halfway 
horizontally between the two, an average of the elevations of the two 
outcrops of the one bed above the other was used in order to eliminate 
the error from dip of the strata. 
The most useful beds for plotting the geologic structure have been 
the Meigs Creek coal, the Pittsburg coal, and the Ames limestone. 
The other strata have not always been found in their expected posi- 
tions, and the number of good comparisons between them and the 
Pittsburg coal have been fewer, so that their true position is not con- 
sidered so well established. 
The following tables give the determined vertical distance between 
the top of the workable coal of the Pittsburg bed and the top of the 
various coals and limestones mentioned above: 
Vertical distance from Pittsburg c<><il (<> t>>i> of Meigs Creek white rune. 
Feet. 
Church at Bloomfield 132 
One and a half miles south of Smithfield 119 
On Smithfield and Cadiz road near Piney Fork 113 
On Cadiz and York road near Hurford Creek Ill 
Vertical ilixt<iu<-< from Pittsburg <-<»tl 1<> l<>p of Meigs Creek coal. 
At the town of Bloomfield 99 
On hill between two Mclntyre creeks, north of Smithfield 92 
One and a half miles southwest of Smithfield 94 
( hi Smithfield ami Cadiz road near Piney Fork 97 
On Cadiz and York road near Hurford Creek 91 
On farm road near north line of township 10, range 4 93 
Vertical distanct from Pittsburg coal t>> t<>p of Pittsburg rider vein. 
On Cadiz am 1 York road near Hurford Creek 26 
On Cadiz and Unionvale pike near Cadiz 24 
On road near north line of township 10, range 4 21 
On ridge east of Amsterdam 26 
1"- rtical distance from Pittsburg coal to Upper No. S limestone. 
On Cadiz and Unionvale pike near Cadiz 12 
On ridge east of Amsterdam 19 
Vertical distance from Pittsburg coal to Lover No. 8 limestone. 
On Cadiz and Unionvale pike near Cadiz 7 
On ridge east i >f Amsterdam, west summit 11 
On ridge east < >f Amsterdam, east summit 9 
