Near Smith’s Ferry, on the north bank of the Ohio, is large group of interesting Indian picture carvings, cut into the surface of the Piedmont sandstone, exposed in the river at a three foot stage of water; they are scattered over the surface of the rock ledge, for a space about forty feet in width, and 700 feet in length, and represent a great variety of the forms of men and animals, birds, fish, and reptiles, including the beaver, bear, wolf, turtle, snake, and eagle, human footprints and the tracks of various beasts; as well as inanimate objects, scalphoop, bows, and arrows; there is also a picture of a bison chasing a dog; another large collection of similar pictures, on the Susquehanna River at Safe Harbor, Lancaster County, contains the same forms of the wolf and the turtle, from which well-known tribes of the Delaware Indians were named, which would seem to connect them with that tribe; casts and photographs of these carvings may be seen at the Carnegie Museum, Pittsburgh. [Illustration: CRAWFORD COUNTY] XXIX CRAWFORD COUNTY Formed March 20, 1800; named for Colonel William Crawford. First well in the world drilled for petroleum, was completed here in 1859; valley of Oil Creek, south of Titusville, once most productive of oil in United States. Land peculiarly suited to grazing, stock raising, and general farming. French Creek was followed by Washington, 1753, from Franklin, Venango County, to Fort Le Breuf, Erie County. He returned, descending it in canoe; on French Creek, north of Meadville, are Saegerstown and Cambridge Springs, with famous health-giving waters. Conneaut Lake, three and one-half miles by one mile, is largest lake in Pennsylvania, covering about 1200 acres.