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| Keywords: Concretions Bear Valley.jpg Concretions of the Llewellyn Formation in the south wall of the Bear Valley Strip Mine located west of Shamokin in Northumberland County Pennsylvania Sept 1998 Rock hammer for scale 1998-09 Own <br />Transferred from http //en wikipedia org en wikipedia Jstuby at http //en wikipedia org en wikipedia location possible en wikipedia Jstuby Original upload log page en wikipedia Concretions_Bear_Valley jpg 2010-04-18 03 01 Jstuby 1500×1000 461508 bytes <nowiki>Concretions of the Llewellyn Formation in the south wall of the Bear Valley Strip Mine located west of Shamokin in Northumberland County Pennsylvania Sept 1998 Rock hammer for scale </nowiki> September 1998 in the United States 1998 in Pennsylvania Bear Valley Strip Mine Shale Sandstone Concretion Siltstone Carboniferous geology Mining tools Geology of Pennsylvania Rock hammer Rocks with objects for scale Rock formations in Pennsylvania | ||||
