Keywords: Catskill1.jpg Devonian Catskill Formation along the Horseshoe Curve in Blair County Pennsylvania Photo taken and uploaded by James Stuby 2007-4-24 Own <br />Transferred from http //en wikipedia org en wikipedia Jstuby at http //en wikipedia org en wikipedia en wikipedia Jstuby Original upload log page en wikipedia Catskill1 jpg 2007-04-24 15 44 Jstuby 712×342 273209 bytes <nowiki>Outcrop of Irish Valley Member of the Devonian Catskill Formation along the Horseshoe Curve in Blair County Pennsylvania Photo taken and uploaded by James Stuby </nowiki> Horseshoe Curve Geologic formations Outcrops in Pennsylvania |