Keywords: Bloomsburg Formation at Port Clinton PA.jpg Outcrop of the Silurian Bloomsburg Formation at Port Clinton Bedding is vertical and cleavage is evident Rock hammer for scale Photographed at the 2012 Field Conference of Pennsylvania Geologists 20 October 2012 <br/> ;Other information cropped from original took myself 2012-10-20 Jstuby Cc-zero Original upload log en wikipedia Bloomsburg+Formation+at+Port+Clinton+PA jpg wikitable - 2012-10-23 01 36 925×1235× 313563 bytes Jstuby Uploading a self-made file using File Upload Wizard Port Clinton Pennsylvania |