div class=trans-pagebuttonPage 1button div class=trans-image amp-img class=trans-thumb alt=Page 1: PP 484 plate 1 - USGS780 01 rg 0b Shep PROFESSIONAL PAPER 484 PLATE 1 Potomac rdstown s Har ers VALLEY Doh SOS Oce 0b Oce 0b Cce Carbonate rocks of Middle and Late Cambrian age Thin-bedded src=https:reader034fdocumentocomreader034viewer20220430215f3d285df4a499799245e668html5thumbnails1jpg width=142 height=106 layout=responsive amp-img divdiv