Retired botanist Arnoldo Santos-Guerra stumbled across the remarkably intact lizard fossil two years ago while searching for snail shells. The 42-pound sandstone block containing the specimen also ...

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 ...

The recent shells retain the organic material that give the shells ... The process may be aragonite crystallizing to calcite, as in fossil snails, or it may be the growth of larger crystals of an ...

Fossils are an essential record of life on ... For example, in the Hawaiian Islands, sediment layers entomb native snail shells—and then the layers above show these snails being replaced by ...

Dr. Jochum explains that "It is not uncommon for the shells of fossil and present-day land snails to be embellished with ridges, hairs, nodules, or folds; however, the development of such ...

said the snails’ shells are dissolving and developing holes in the Arctic Ocean. Kimoto said higher concentrations of airborne CO2 from human activities, such as burning fossil fuels ...