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Conglomerate
Quarz conglomerate, Hertfordshire puddingstone, St Albans, England -
Basalt
Different forms of basalt -
Sea Urchin Fossil
Archaecidaris, Carboniferous, Brown County, USA -
Pecopteris Fern Fossil
Pecopteris miltonii, Carboniferous, a fossilised fern from Kladno, Czech.