The Carlisle Deluge, 1779
On the night of August 19, 1779, there occurred on the south side of the North Mountain about ten miles northwest of Carlisle a geological phenomenon that eventually drew the attention of the astronomer David Rittenhouse, Dr. Benjamin Franklin, the Secretary of War, and the president of Harvard College, and was described both in private letters among these and other men and also in the published proceedings of the second oldest learned society in the United States.