Canyon, the southern section of the park. The only trail bridging the Genesee River in the park crosses a stone bridge just below the Lower Falls. The Middle Falls is the highest, and the Upper Falls has a recently-built (2017) active Norfolk Southern Railway arch bridge crossing immediately above it, replacing a historic 1875 Erie Railroad bridge. The park also contains Inspiration Falls, a ribbon waterfall that is located on a tributary creek a short distance east of the Inspiration Point Overlook, west of the park visitor center. It has a total drop of . While impressive in its height, it is seasonal and often appears as only a water stain on the cliff. The falls faces to the south-southwest and has a crest that is wide. The bedrock exposed in the gorge is Devonian in age, mostly shales, with some layers of limestone and sandstone. The rock was laid down in an ancient inland sea, and it holds many marine fossils. The landform of the section of the Genesee River valley represented by the park is geologically very young, caused by a diversion of the river from the old valley by the last continental glacier, which forced the river to cut a new section of valley. Historic sites and museums The historic, restored Glen Iris Inn, William Pryor Letchworth's former residence adapted for use as a hotel, is located on the top of a cliff overlooking Middle Falls and offers in-season meals and overnight accommodations. It is open to the public for breakfast, lunch and dinner. The park is the present-day site of the grave of Mary Jemison, a Scots-Irish immigrant pioneer who was captured at the age of 12 from central Pennsylvania by a French and Shawnee raiding party during the French and Indian War. She was soon adopted by a family of Seneca people, and eventually lived in western New York on the Genesee River. She became thoroughly assimilated and chose to live with the Seneca for the rest of her long life, having a total of seven children by two successive husbands. Her remains were exhumed from the Buffalo Creek Reservation and reinterred on the grounds of a Seneca Council House, relocated to the site by Letchworth and rededicated in 1872. The park also features the William Pryor Letchworth Museum, which was founded with the collections of the park's founder. The exhibits focus on the natural