262 



I. c. 



WHITE PETROLEUM FIELDS OF NORTHEASTERN MEXICO 





Chijol No. k — Continued 



Feet 





Feet 





1,176 



White shale. 



1,597 



White shale. 



1.206 



White shale. 



1,611 



Gray shale. 



1.270 



White shale. 



1,628 



Struck more oil. 



1,307 



White shale. 



1,633 



Hard shale. 



1,373 



Hard shale. 



1,640 



Hole filling up. 



1,400 



White slate. 



1,645 



Hard. 



1,407 



White slate. 



1,655 



Well flowing November 12, 



1.410 



Crevice with oil. 





1909. 



1,444 



Oil, very hard. 



1,665 



Hard. 



1,516 



Hard shells. 



1,693 



White shale. 



1,524 



Very hard. 



1,741 



Oil and gas, January 19, 





Pumping oil. 





1910. 



1,567 



With oil (white shale). 









Chijol No. 



5 







Top 







Feet 





Feet 





25 



Yellow clay. 



1,100 



Hard. 



30 



Gray shale. 



1,102 



Soft. 



35-45 



Hard rock. 



1,104 



Hard. 



52 



Black shale. 



1,124 



Light shale. 



70 



Black hard rock. 



1.155 



Hard shale. 



85 



Light hard shale. 



1,202 



Limestone. 



103 



Hard gray rock. 



1,217 



Hard shale. 



107 



Brown shale. 



1,263 



Light shale. 



116 



Hard shell. 



1.310 



Light shale. 



119 



Lava rock (basalt). 



1.370 



Light shale. 



123 



Crevice with oil. 



1,415 



Hard shale. 



137 



Brown sandy shale. 



1,433 



Soft shale. 



205 



Shale. 





Oil. 



223 



Brown shale. 



1,468 



Gray shale. 



230 



More oil. 



1.500 



Light shale. 



248 



Very hard. 



1,530 



Gray shale. 



256 



Hard shell. 



1,639 



Gray shale. 



337 



Very hard shell. 



1,664 



White shells. 



344 



Hard rock. 



1,735 



Hard. 



348 



Fine shale. 



1,741 



Soft. 



374 



Hard shell. 



1,766 



Light shale. 



520 



Hard shell. 



1.843 



Hard gray rock. 



785 



Very hard. 



1.866 



Shale and shells. 



800 



White shell (caving). 



1.900 



Blue shell. 



825 



Shale. 



1.944 



Soft shale. 



842 



Gray shale. 



1,993 



Hard. 



844 



Soft shale. 



2,019 



Shale and shells. 



868 



Light shale. 



2.034 



Hard. 



918 



Gray shale. 



2,044 



Hard. 



995 



White shale. 



2,069 



Hard shale. 



1,000 



Lime rock. 



2.092 



Hard shale. 



1.C02 



Hard. 



2,012 



Well flowing March 12, 



1,032 



Hard shale. 





1911. 



