![](http://www.alamy.com/thumbs/6/9B495A6E-44B3-45B3-B6E0-96163ED33EE9/2GNKA15.jpg)
Part of the sea urchin, a Carboniferous fossil in limestone
Part of the sea urchin, a Carboniferous fossil in limestone. Close-up, selective focus and white background.
Size: 3119px × 2828px
Photo credit: © Olga Popkova / Alamy / Afripics
License: Royalty Free
Model Released: No
Keywords: animal, archaeological, archeology, biology, calcarea, carbon, dig, discover, era, excavations, extinct, extinction, fiber, fossil, fossilized, geological, geology, limestone, natural, nature, palaeontology, paleontology, petrified, porifera, rock, sea, specimen, sponge, stone, urchin