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Date: 2012-02-13 04:25:15Concretion Mineralogy Minerals Basalt Dumbarton Castle Joint Sedimentary rock Rock City Kansas Geology Petrology Volcanic rocks | Agglomerate Dumbarton Rock - Where is it? This grey flattish mass of rock is a tuff formed from volcanic ash, indicating the proximity to theDocument is deleted from original location. Download Document from Web Archive |