Clark Reservation State Park is a state park in Onondaga County, New York. The park is in Jamesville, NY, in the Town of DeWitt, south of Syracuse. It was the site of a large waterfall formed by melting glacial ice at the end of the last Ice Age; the plunge basin at the base of the old falls is now a small lake. James Macfarlane described the area in 1879, "On approaching the lake from the turnpike on the south side, the tourist is startled at finding himself, without any notice, on the brink of a yawning gulf, precisely like that of the Niagara River below the Falls, and nearly as deep." Clark Reservation is also noted for its many ferns; it harbors the largest population in the U.S. of American hart's tongue, which is so rare that it was declared endangered in the U.S. in 1989. The park is in size, and logs over 160,000 visitors per year. It encompasses the cliff, plunge basin and gorge of the ancient waterfall, and a number of secondary ravines and basins. Glacier Lake, which occupies the plunge basin of the former waterfall, is in size and deep; it is a rare meromictic lake in which the deep waters don't mix annually with the surface waters. The surrounding limestone cliffs are high. Hiking trails skirt a half-ring of cliffs surrounding the lake, as well as traversing the rugged limestone over which the old river flowed. A Nature Center is operated by the Friends of Clark Reservation, a nonprofit organization staffed completely by volunteers. The Center has exhibits about the park's geology and natural history, and is open from Memorial Day to Labor Day. In addition to staffing the Center, the Friends group also organizes events and retains a naturalist each summer to guide hikes and create nature programming for the public in the park. The park also offers fishing, hiking trails, picnic tables and pavilions, and a playground. History Before the arrival of the Europeans, the land around the park belonged to Onondaga people. In the late 18th century, these lands were divided into military tracts to be awarded to soldiers returning from the Revolutionary War. Joshua Clark noted the lake and its precipitous cliffs in his 1840 book about Onondaga County. In 1879, James Macfarlane purchased the area around the fossil waterfall and the lake, and opened a small resort hotel in