found: Work cat.: Karst of Sinking Valley and Kooken Cave, Huntingdon and Blair Counties, 2012:p. 49 (Tytoona Cave, in Sinking Valley, Pa.) p. 51 (through the centuries, the cave has been known as Arch Springs Cave [and] Sinking Valley Cave. Later through commercialization, it was known as Tytoona Cave and Indian River Caverns) p. 55 ([Tytoona Cave] was a combination of the names of two nearby towns, Tyrone and Altoona)
found: Wikipedia WWW site, June 7, 2012:Tytoona Cave p. (Tytoona Cave is located approx. 1 mi. from Arch Springs, Pa. in Sinking Valley, near Tyrone and Altoona; length 4,200 ft.; discovered ca. 1750)
notfound: GNIS, via WWW, June 7, 2012;Columbia gazetteer of the world, c1998