A SHORT NOTE ON THB OIL FIELDS OF MÉXICO 127 



termiteul. There are gushers of very long life. I cited several 

 times the first prodncing well of La Pez which produced 

 about 1,500 barréis a day foi* nearly seventy months. 



I 'articular difíiculties for rapid successful drilling are 

 to be encountered in northern Tamaulipas and south Vera- 

 cruz as well as in the east coast of Oaxaca and Tabasco, 

 for the geological conditions of the shales are dissiraulated 

 by thick capings of river and marine gravéis in the north 

 and very powerful stuary muds in the south covering the 

 vast pleniplain extended in the isthmian country. The part- 

 icular location of the Isthmus with regard to the rest of 

 the eastern coast of México and the Yucatán peninsula 

 has created peculiar climatic conditions facilitating new 

 sedimentation favored by abundant rains, winds, heat, 

 rivers, etc. 



México, July 1914. 



