Whaleback Anticline, Shamokin, PA. NASA Earth Science Picture of the Day for 11 January 2008. http://epod.typepad.com/blog/2008/01/whaleback-anticline.html http://www.dcnr.state.pa.us/topogeo/pnhp/whaleback.aspx http://www.dcnr.state.pa.us/topogeo/photogallery/whale.aspx http://www.geosc.psu.edu/~engelder/geosc465/Trip2.rtf http://www.geo.cornell.edu/geology/classes/RWA/GS_326/photo_galleries/bear_valley_field_trip/ Copyright Dave Kerr, 2007.
Photo copyright Dave Kerr.