A ROMAICS OF THE YELLOWS T DIE 
GEOLOGY OF THE GRAIL CANYON, 
lotes introduced here in 1929, fifty 
years after the publication of my interpre- 
tation of the geology of the Yellowstone 
Canyon as reported in the Hayden Annual 
Report for 1878, by Professors Field and 
Jones, Their notices appear in the American 
Journal of Science, Volume XVII, March, 1929, 
and elsewhere. 
