DETERMINING THE STRUCTURE OF BEDDED ROCKS 167 
gestions have been carefully verified in the field. Otherwise, 
obviously, there would be a very natural tendency to eliminate 
all data which did not make for a structure corresponding to the 
preconceived ideas of the worker. It may be added, however, 
that on nearly all occasions where the models have seemed to 
demand the rejection of certain data the further investigations in 
the field have justified this elimination. 
