98 A GEOLOGICAL SURVEY OF LANDS 



feet. What is the volume of the porous space in a cone of sand- 

 stone having a basal diameter of 3520 feet and a height of 45 

 feet? The porous space of sandstone ranges from twenty-seven 

 to forty-five percent of the volume of the rock. In this case it is 

 not less than thirty percent. The pressure under which the gas 

 was held, judging by the depth of the well and the height to which 

 water and debris was spouted (60-80 ft. ) by the well, is estimated 

 at 230 pounds per square inch, or about fifteen atmospheres. The 

 quantity of gas should hence be equal to the volume of the 

 porous space multiplied by fifteen. This will make about 220 

 millions cubic feet of gas. 



On the flattened south end of the Lampasitas arch it would 

 seem almost a foregone conclusion that there should be other 

 minor folds like the Mula dome, and it seems likely that some of 

 these may prove to be gas bearing also. Some of the places 

 showing e^ dip to the west vasij prove to be on the west side of 

 such folds. A list of these have already been given (see page 89). 

 The three places where crests of minor anticlines are most strong- 

 ly indicated are (1) about one third of a mile west-northwest 

 from the southeast corner of survey 18 in block 6, (2) on the cen- 

 tral tract of survey 11 8 in the same block, and (3) near the central 

 part of the south half of survey 22 in the same block. 



Petroleum. 



With the gas that is at present escaping from the Mula creek 

 well there is also a small quantity of oil, which accumulates on 

 the top of the water that, now fills the well. A sample of this oil 

 was submitted to Messrs Edgar and Carr of the Dearborn Labo- 

 ratories in Chicago, who reported to Col. W. L. Evans, Jan. 27, 

 1906, as follows: 



Report on the Quality of Oil fhom the Mula Creek Well. 



Gravity, 23. 4 Baume. 



Flash point, 280° Fdhr. 



Burning point, -3.30° Fahr. 



Heat value (Parr calorimeter per pound of oil) 17808, British thermal 



units. 



The analysts add the following comments: '"From the above 



results tu tests made upon the sample at hand, we conclude that 



this is not a desirable crude from a refining point of view. It 



shows very similar to other crudes from Texas, except that the 



