183 



A. Gexeral Stkucture. I. 6'//'a%roj)/i?/— Giving a general section and 

 brief outline of the extent, thickness and character of each rock- 

 series— (map) ; also a table showing the total thickness of the drift 

 as obtained from borings. II. Altitude of the strata — Views concern- 

 ing the nature and extent of the Cincinnati arch ; topography of 

 Trenton limestone, as made out from well-borings. (Hypsographic 

 map and cross-sections of Trenton limestone.) The hypothetic 

 " Wabash arch " is briefly described. Prof. S. S. Gorby's views, as 

 contained in 15th Ann. [Rep. Geol. and Nat. Hist of Indiana, are 

 quoted. 



B. Conditions OF Gas Accumulation. Sec. I. Conditions of rock struc- 

 ture. II. Conditions of rock texture. 



O. Gas Pressure and Measurement. Defines I. Static pressure. II. 

 Open pressure. III. Retained pressure. IV. How to measure the 

 amount (cubic feet) of gas yielded ; gives tables showing capacity 

 of wells. 



D. The Gas Field and the Borings Within it. I. The area yield- 

 ing gas and oil. II. Records of borings within the main field re- 

 viewed by counties — (Blackford, Jay, Delaware, Randolph, AVayne, 

 Madison, Grant, Howard, Tipton, Hamilton, Hancock, Marion, 

 Miami, Wabash, Henry, Rush, Shelby, Decatur, Franklin, Dear- 

 borne, DeKalb) giving number of wells in each county and aggre- 

 gate daily flow, etc. 



E. Record of Borings Outside of the Gas Field. Gives record of bor- 

 ings in the following counties : Union, Fayette, Bartholomew, 

 Jennings, Jefferson, Clarke, Floyd, Harrison, Washington, Jackson, 

 Johnson, Hendricks, Montgomery, Parke, Boone, Clinton, Carroll, 

 White, Pulaski, Cass, Miami, Fulton, Porter, Lake, Laporte, St. 

 Joseph, Marshall, Elkhart, Kosciusko, Whitley, Noble DeKalb, Al- 

 len, Wabash, Jiuntington, Wells and Adams. 



F. The Care of Gas AVells. 



Pike county Coal. Geology. Owen's Rep. 1859-60 ; Cox 1872, do 1870 ; 



coal, J. Collett's Rep. 1883. (See also Lesquereux.) 

 Pitman's Cave. Description of. E. T. Cox Rep. 1872. 

 Pocono. (Group.) See J. J. Stevenson. 

 Patton A. Antiquities of Knox county, Ind., and Lawrence county, 111. 



Anual Rep. of the Board of Regents of Smithsonian Institute, 1873. 



Forty-third Congress, first session. Senate Mis. Doc. No. 130, 1S74. 



