The process may be aragonite crystallizing to calcite, as in fossil snails, or it may be the growth of larger crystals of an existing mineral such as the large calcite crystals in the algae (note the ...

Fossil shell of Pithocerithium rubiginosum (height is 1.5 cm) from the Miocene sediments of Nexing in Austria (left) and isolated reddish polyene pigments on calcium fluoride disc (diameter of ...

Fossils are an essential record of life on Earth ... You may encounter giant African land snails in the Hawaiian Islands, Amur River clams in San Francisco Bay, and Mediterranean mussels along ...

such as snails, clams and cephalopods. The findings have also resolved a classic debate about the evolutionary relationships of some mollusks. Thus, the controversial living fossils or ...

Kadisha: That isn't a snail. That's an ammonite. William Whiskerson: An ammonite? Kadisha: Yes. William Whiskerson: What's an ammonite? Cameron: A type of fossil. William Whiskerson: Oh ...