Sources of Subsurface Information 1151 



and use of the Fusulinidae, important Permian and Pennsylvanian index 

 fossils. 



The laboratory offers two types of service : 



1. Reports on important tests in the west Texas-southeastern New 

 Mexico district are issued at regular intervals. These reports comprise 

 paleontologic data and some formation or zone tops based on fossils 

 and lithology. 



Subscribers have access to (a) paleontologic data prepared during 

 the period of tlieir subscription, except "tight well" data, which are 

 reported after samples are released; (6) fusuline thin sections, fossils, 

 microfossil slides, a comprehensive library, card catalogs, faunal lists, 

 etc. More than 30,000 indexed fusuline thin sections and microfossil 

 slides are on file. 



2. Special investigations are conducted in paleontology or strati- 

 graphy, surface or subsurface. This work is on a consulting basis. 



Regular reports are issued on the first and fifteenth of each month. 

 Normally the paleontologic data involve twelve to fourteen tests each 

 month, covering 30,000 to 50,000 feet of section. 



An attempt has been made to describe lithologies using color terms 

 from the Rock Color Chart prepared by the Rock Color Chart Committee 

 and distributed by the National Research Council. An attempt is also 

 being made to apply the tentative grade scale for carbonate rocks pro- 

 posed by Deford.^ 



South Dakota School of Mines and Technology 

 Rapid City, South Dakota 



The Department of Geological Engineering at the South Dakota 

 School of Mines and Technology has on file samples and electric logs 

 for nearly all of the significant wells in the Dakota Basin, as well as 

 numerous wells in adjacent parts of Nebraska, Wyoming, and Montana. 

 These are available for study at any time, and space is available for the 

 visiting geologist. 



An up-to-date list of wells and electric logs may be obtained upon 

 request. 



Kansas Geological Society 

 Wichita, Kansas 

 The Kansas Geological Society, a nonprofit organization, sponsors 

 the Kansas Well Log and Sample Bureau. 



The well-log service consists of all the current completions mailed 

 each week to the subscribers at a monthly rate of $12.50. 



If only old logs of a certain district are desired, prices are as follows: 

 1 to 25 logs, 25 cents each; 26 to 50 logs, 20 cents each; 51 to 100 logs, 

 15 cents each; and over 100 logs, 10 cents each. 



2 Deford R. K., Tentative Grade Scale for Carbonate Rocks: Am. Assoc. Petroleum Geologists Bull., 

 vol. 30, no. 11, pp. 1921-1928, Nov. 1946, 



