The Appalachian oil field is unquestionably the best known of any of the American fields, not only for the reason that it is the oldest, but be cause, being the first, it attracted the attention of geologists and oil men to a degree never attained by any of the fields subsequently opened. Its literature is voluminous and its published historical and scientific record, are more complete than those of any other field in the United States. The structure has been worked out over broad areas with great detail and refinement, especially in the northern and central sections of the field, by the National and State geological surveys, and probably few, if any, of what may be called the major dynamic structures have escaped recognition.
Nevertheless, much still remains to be accomplished in unraveling the minor, but by no means unimportant, details of structure and in reaching a better understanding of . . .