STEVENSON, COAL BASIN OF COMMENTRY 
203 
Staffordshire must have originally possessed and the perfect resemblance they 
must have had to an undisturbed subaqueous accumulation.” 
In one important respect Fayol differs from Jukes. The latter evi¬ 
dently recognized that only a small part of the vegetation growing upon a 
drainage area could ever find its way to deposition in a basin, for he thought 
that the whole of the coal measures, coal included, was deposited by one con¬ 
nected operation of the same physical forces upon these materials through 
an indefinite but immensely long period of time. Fayol’s calculation based 
evidently on the conception that the vegetation was dense and continuous 
over the whole drainage area, while, at the same time, it was in constant 
transference to the basin, is that 170 centuries sufficed for formation of the 
whole series at Commentry. 
