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2010-04-18 03:01 Jstuby 1500×1000 (461508 bytes) [[Concretion]]s of the [[Llewellyn Formation]] in the south wall of the Bear Valley Strip Mine, located west of [[Shamokin, Pennsylvania|Shamokin]] in [[Northumberland County, Pennsylvania]]. Sept. 1998. Rock hammer for scale.
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siltstone
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September 1998
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{{BotMoveToCommons|en.wikipedia|year={{subst:CURRENTYEAR}}|month={{subst:CURRENTMONTHNAME}}|day={{subst:CURRENTDAY}}}} == {{int:filedesc}} == {{Information |description={{en|1=Concretions of the [[:en:Llewellyn Formation|Llewellyn Form