In the May number of the Bulletin of The American Association of Petroleum Geologists (Vol. 19, No. 5, p. 702) appeared a note by Professor George H. Chadwick to the effect that the Thorold sandstone at Rochester is not of Thorold age and should be designated as the “Kodak.” The following consideration of Professor Chadwick’s views indicates that the addition of another term to the already overburdened nomenclature of the region may be unnecessary.
The presence of Arthrophycus in the Thorold of the Niagara Gorge and its absence in the “3 feet of ‘white’ sandstone” topping the red Medina in...
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