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Waubakee Formation DrillCore2.jpg - Gorthian
Gogebic Range.jpg - Pi3.124
Fractures in dolostone cave ceiling (Prairie du Chien Group, Ordovician; Crystal Cave, near Spring Valley, Wisconsin, USA) 1 (18755660900).jpg - Natuur12
Bedding in cave wall (Prairie du Chien Group, Ordovician; Crystal Cave, near Spring Valley, Wisconsin, USA) 2 (18319951234).jpg - Natuur12
Travertine dripstone in dolostone network cave (Crystal Cave, near Spring Valley, Wisconsin, USA) 1 (18917284076).jpg - Natuur12
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