The discovery in commercial quantities of natural gas and oil in the Trenton limestones of Ohio and Indiana led to the drilling of numerous test-wells in other states that were underlain by this formation. The attention of prospectors was early directed to New York state as a promising field, and in the spring of 1887 a test-well was drilled in central New

York, near Morrisville, Madison county. At that time the writer, who was an instructor in the geological department of Cornell university, recognized the value of the data that might be obtained from these well records in giving the thickness and dip of the various terranes composing the series of New York rocks. During the remainder of 1887 and the years of 1888—’89, when test-wells were being drilled at numerous localities in New York, various wells were visited personally and arrangements made with the owners and drillers . . .

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