222 WILLIAM H. FRY 
particular mount was a calcareous shale or a shaly limestone. 
But predominance of one or the other of the materials was con- 
sidered sufficient to place a sample, the less abundant material 
being considered as an impurity and being indicated by an appro- 
priate adjective. Before coming into the writer’s. hands, the 
samples had been subjected to a mechanical analysis and all 
particles less than 0.005 mm. diameter discarded. The amounts 
of these very small particles, however, were not large enough to 
vitiate the accuracy of the determinations. 
The sections are given in the accompanying tables. 
