Chapter 12, Section 7 – Madison, History of Armstrong County Pennsylvania
Chapter 12, Section 7 Madison Geological. The general geological feature of this township, as given to the writer by W. G. Platt, are: Only Lower Productive rocks make the uplands. The lower part of the deep valleys, which skirt the township, are composed of conglomerate and subconglomerate rocks. The Upper Freeport coal is represented only … Read more