PAPERS OX GEOLOGY AND GEOGRAPHY 399 



Warsaw beds in contact with almost horizontal Chester 

 beds. Its presence is further substantiated by a well 

 drilled apparently on the fanlt plane or close to it. which 

 encountered considerable "creviced rock" and clear 

 transparent cpiartz, as well as a rather unusual succession 

 of limestones. 



The east side of the anticline is much less steep than 

 the west, and has an average dip, as indicated by struct- 

 ure maps, of about 4~ to the east. 



THE peoductbt: aee.\s 



The greater part of the production in this field comes 

 from a tract about a mile long and a third of a mile wide, 

 which comprises the top of the anticline. Most of this 

 area has already been drilled, but there is a possibility 

 of the extension of production somewhat farther to the 

 north and south, particularly along the axis of the anti- 

 cline. 



There has been a little production about three miles 

 south of the main pool in section 21 on what appears to 

 be a narrow terrace, or slight flattening of the pitch of 

 the main anticline. The wells located on the top of this 

 terrace come in at from 5 to 10 barrels, and those slight- 

 ly off on the sides, though dry in the Kimmswick, show 

 gas in small ciuantities in what is probably the Keokuk- 

 Burlington. 



Between the large and small producing areas and also 

 south of the latter, all wells drilled on the axis of the 

 anticline have showed oil, but none in sufficient quanti- 

 ties to make profitable wells. 



THE GEOLOGIC COLUMN 



The geologic column in this area is relatively simple, 

 but some interesting features are brought out in studies 

 of the well cuttings. The formations may be described 

 briefly as follows: 



THE MISSISSIPPL^N SYSTEM 



St. Louis Limestone: 



The St. Louis limestone is a fine grained, dense, hard, 

 compact rock which locally contains numerous nodules 



