26 ANNUAL REPORT 
the Mountain limestone. It may be well to state that in Southeastern 
Ohio the Pottsville formation loses its conglomeritic nature, and becomes 
sandy and shaly. There are two sands that should be noticed, viz., the 
Salt sand and the Maxton sand. 
The relative positions of these are shown in the Mead farm record 
given on page 23. 
The Maxton Sand.—This rests immediately on the mountain lime- 
stone, or is separated from it by a few feet of shales. The sand has been 
reported in the eastern part of Washington and the southern part of 
Monroe counties only. Its area is small and within this the sand is patchy. 
It is of little importance as a producer of oil or gas. 
The Salt Sand.—This sand, as its name indicates, contains much salt 
water. It was the source of the brine of the salt works which formed so 
important an industry in southeastern Ohio one-half century ago. 
Testing for it was an important aid in proving the existence of oil in the 
rocks of the Coal-measures. It is very generally confused with the Big 
-Injun sand in those counties where the Mountain limestone is not found. 
The Salt sand is not important as a producer of either oil or gas. 
Coal-Measures Proper.—While a large number of strata belonging 
to the Coal-measures have been or are now sources of oil, comparatively 
few of these have been important in a commercial sense. Generally the 
sands are local, and cannot be traced over an area of more than a fraction 
of a mile. Such sands usually have names, but because of their small 
area and production they will not be further noticed in this article. The 
most important sands of the Coal-measures are the following: 
Goose Run sand. 
Mitchell sand. 
First Cow Run sand. 
Macksburg 500-foot sand. 
Second Cow Run sand. 
a ea 
The relative positions of sands I and 3 are shown by the following 
data taken from Centennial Well No. 6 at Cow Run: 
Depth to top — 
Thickness. of formation 
: Feet. in feet. 
Pittsburg sCOal 5 Osi ct tics ev casneetorel ce terol suneiecn seas 1 11 
Hirst: CowaRunesan dss eae ater eeranene 47 325 
Second’ Cow Run sand... 55. cle ee se ee 64 776 
The stratigraphical relation of sands 2 and 3 is shown by the follow- 
ing record taken from Dunn Well No. 6, near Macksburg. The well head 
is six feet below the Meigs Creek coal. 
