- Conglomerate
Quarz conglomerate, Hertfordshire puddingstone, St Albans, England - Basalt
Different forms of basalt - Sea Urchin Fossil
Archaecidaris, Carboniferous, Brown County, USA - Predella panel St Peter Martyr
Predella panel St Peter Martyr, Madonna della Pergolata (1446-47) by Giovanni Boccati. Galleria Nazionale dell'Umbria, Perugia.