THE OIL- AND GAS-PRODUCING ROCKS OF OHIO 835 



The positions of sands 3 and 4 are shown by the record of 

 Centennial Well No. 7, at Cow Run. The well head is at the 

 horizon of the Meigs Creek coal. 



The relative positions of sands 4 and 5 are shown by the fol- 

 lowing taken from Reed Well No. 4, near Marietta: 



f top at 300 feet 

 Goose Run sand - \ , 



I bottom at 331 



Mitchell sand 



I 



top at 525 

 bottom at 546 



The Second Cow Run sand. — This is one of the least important 

 members of the group now under consideration. It has been a 

 small producer at Cow Run in Washington county for more than 

 thirty years, but rarely has been found beyond that locality. It 

 is reported, however, quite frequently, for the driller gives this 

 name to almost any sand lying from 100 to 500 feet below the 

 first Cow Run sand. As may be seen from the records given the 

 interval between the two is 400 feet. It lies 760 feet below the 

 Pittsburg coal, and is the thickest member of the group, sometimes 

 exceeding 60 feet. Occasionally the formation is divided by 

 few feet of slate, in which case the oil lies in the lower part. 

 The sand possesses no qualities that serve to distinguish it from 

 the higher members. 



The sand belongs near the base of the Coal-measures. The 

 partial record of the Rice well, given below, shows it to be the 

 first sand above the Salt sand, the two being separated by 79 feet 

 of shales, the latter probably the equivalent of the shales of the 

 Logan group. This, with the thickness of the formation, and the 

 fact that it is sometimes divided by a few feet of shales, makes 

 quite certain its identification as the Massillon sandstone. 



The Macksburg 500- foot sand. — This is important at Macksburg 

 and vicinity only. It lies 670 feet below the Meigs Creek coal 



