FORMATION OF SEDIMENTARY ROCKS 253 
In the foregoing table are given the compositions of the end- 
products of redistribution and their relative abundance. 
In order to find the composition of the sum of the end-products, 
it is necessary to combine the above analyses in the ratios of abun- 
ance. In Table VI the result of this calculation is given and com- 
pared with the composition of the average crystalline rock. 
TABLE VI 
Composition of Comp. of Comp. of 
Average Sediments Diff. Combined Diff. 
Crystalline Rock 82:12:6 End-Products 
Si@peaciacnicrsaie tras 61.60 63.64 +2.04 61.39 —0.21 
INI O Retain sarees 15.47 14.71 —o.76 14.16 =a 
WE Seperate cease) tia lecel cena ck? 4.60 4.46 —0.13 4.58 —0.02 
INGO) Nessie scesasers estates 4.18 2.90 1528 3.21 —OnOi7 
CAO Manes eke ies 4.93 7.34 +2.41 Fer +2.18 
Nia OWS esi ke os ac 3.50 T=20 —2.21 3.99 +0.49 
I OFS Pate h ce rouesyse B02 Bele +0.10 3.06 +0.04 
By comparing the two columns of differences in Table VI, it is 
seen that the sum of the differences arising when only the sedimentary 
rocks are considered is reduced by more than half by including the 
other end-products in the combination. ‘The discrepancy for each 
of the elements except one is made considerably smaller. In the 
case of alumina the difference is increased from 0.76 to 1.31, but for 
each of the other components the differences are decreased. This 
very evident improvement in discrepancies would seem strongly to 
indicate that the discrepancies are to a large extent due to not includ- 
ing in the consideration of the problem all of the end-products of 
redistribution. It is not improbable that with better figures for average 
composition and abundance the differences would be reduced still more. 
The close accordance between the composition of the combination 
of sedimentaries and the original crystalline rock, and the relatively 
small corrections produced by taking into account the other end- 
products, argues the probable correctness of the ratios determined, 
and also shows the relative unimportance of the minor end-products 
of redistribution. 
COMPARISON WITH OTHER ESTIMATES 
Van Hise estimated the relative abundance of the three sedimen- 
taries as 65 parts shale, 30 parts sandstone, and 5 parts limestone. 
