FORMATION OF SEDIMENTARY ROCKS 249 
RESULTS 
The method of solution here described was applied to the four 
average analyses given in Table III, and the triangular diagram 
thus obtained is shown in Fig. 6. Since all the lines of the several 
elements in Fig. 6 do not intersect at a common point, some point 
must be selected which will give a minimum of discrepancies when 
the combination of the sediments is compared with the composition 
Shnate 
Fe 
----> Point representing ratio 
of Sedimentary Rocks 
A K,0 corresponding fro 
A MgO average Crystalline Rock. 
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Fic. 6 
of the average crystalline rock. A rough idea of what these ratios 
are may be obtained from a general inspection of the diagram, and 
it is seen at once that a point as near to all of the lines as possible 
lies near the “Shale” corner of the triangle and a little to the left, 
indicating a large predominance of shale and more sandstone than 
limestone. The two elements which have the greatest bearing on 
the selection of the best ratio are calcium and silicon, since these 
two elements are more unevenly distributed among the three sedi- 
