I just scanned the pictures taken yesterday southeast of Wartburg. The = first is a cropped 20 mm shot to show the context of the site (Stndrck1.jpg= ). A waterfall has developed on the thin, resistant, lower bench of the = Wartburg Sandstone where it overlies the Glenmary Shale. The fall has = retreated upstream by selectively eroding the much less resistant shale. = Subsequently the sandstone is cantilevered until it breaks off and falls. = This piece happened to land just right and stands 15 feet (~5m) high = (Stndrck2.jpg). Neat, huh? Jim