212 



cox. 



manufacture, the material might be easily available. On the other 

 hand, if the proper constituents were to be found, tliese shales might be 

 mined after the manner adopted by some successful cement companies 

 now operating. 



The samples were obtained from a drill hole made in the Moncao basin 

 on the left bank of the river about 1.5 kilometers from its mouth and at 

 an elevation of 5.8 meters. 



A vertical section of the drill hole shows : 



Material. 



Thickness. 



Total depth 

 of hole. 





Meiers. 

 1.8 



22.5 

 0.3 

 5.6 



17.9 

 9.1 

 4.6 

 6.0 

 7.7 

 3.1 

 1.0 

 3.5 

 2.9 

 7.7 

 4.4 

 3.4 

 8.6 

 1.5 

 2.3 



19.1 

 0.6 

 0.3 

 0.8 

 6.5 

 1.2 

 1.5 



39.9 

 0.3 

 2.4 

 4.5 

 1.6 



Meters. \ 

 1.8 



24.3 



24.6 



30.2 



48.1 



57.2 



61.8 



67.8 



75.5 



78.6 



79.6 



83.1 



86.0 



93.7 



98.1 



101.5 



110.1 



111.6 



113.9 



133.0 



133.6 



133.9 



134.7 



141.2 



142.4 



143.9 



183.8 



184.1 



186.5 ■ 



191.0 



192.6 



Blue shale _. 



Limestone 



Fossil shale - - - _ 









Shale and limestone 



Blue shale _ 







Shale and limestone 







Limestone -- 









Limestone 



Blue shale - _ - _ 









Blue shale 



Shale and limestone 



Limestone 







shale and limestone 









The chemical analyses of some of the materials are given in Table I. 

 I also give the average of the analyses of two limestones which agree 

 very closely in composition; these were taken from drill holes numbers 

 5 and 6. 



