432 BO WEN AND AUROUSSEAU FUSION OF SEDIMENT AKY ROCKS 



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more or less complete 

 fusion of the rock. 

 Fused cores have been 

 examined by competent 

 geologists and pro- 

 nounced the result of 

 fusion of the sediment- 

 ary rock in place,^ but in 

 spite of this fact some 

 operators are unwilling 

 to accept their findings 

 and believe that natural 

 igneous material was en- 

 countered. 



A particular good ex- 

 ample of a fused core 

 was obtained in a well 

 being drilled in Califor- 

 nia under the super- 

 vision of Prof. Bailey 

 Willis. This, together 

 with another not so well 

 preserved, was sent by 

 him to this Laboratory, 

 and the results of our 

 examination are set forth 

 in the present paper. We 

 are greatly indebted to 

 Professor Willis for the 

 opportunity of studying 

 this material and for in- 

 formation regarding the 

 conditions under which 

 it was formed. 



The better core comes 

 from a hole near Suisun, 

 California, known as 

 Montezuma well number 

 1. At a depth of 4,350 



-A. F. Rogers: Seventh Annual Report, State Oil and Gas Supervisor, vol. 7, no. 9, 

 California State Mining Bureau, March. 1922, p. 6 ; C. S. Ross, Bull. Am. Assoc. Petro- 

 leum Geol., vol. 6, 1922, pp. 372-374. 



