Excerpt from Water-Supply and Irrigation Papers of the United States Geological Survey: No. 57; Preliminary List of Deep Borings in the United States; Part I, Alabama-Montana

The wells and borings reported in the paper are all more than 400 feet in depth. The information concerning them has been obtained partly from replies to circular letters sent to all parts of the United States and partly from geological reports and other published sources. Owing to the difficulty of obtaining replies to the circulars, to lack of knowledge on the part of correspondents, and to the incomplete ness of published records, doubtless there are borings which have not been reported. In regions of oil and gas wells, where borings are numerous, the individual wells can not be listed here, but representa tive wells are given. References to logs or records of the wells, or extended descriptions of them, are given in footnotes, and after the list of wells in each State there is.added a list of the principal publi cations relating to deep borings in that State.

The bearing of the information given in the columns of the lists probably is apparent, unless, perhaps, in the one headed Height to which the water rises. In this column an entry such as 45 indicates that the water rises to within 45 feet of the surface; 45 indicates that it is a flowing well and has sufficient head to raise the water 45 feet above the surface in an open pipe 45 feet or more in height. The yield in gallons per minute usually is estimated. Depths and diameters often have been reported from memory, and different sources of publication sometimes give different figures. Most wells which are not. Stated to be for oil, for gas, brine, aban doned, etc, in the remarks column, or not any in the yield column, generally afford more or less water. Many of the gas and oil wells, active or abandoned, yield salt water.

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