The ratios of strontium isotopes in fossil shark teeth can be used to better understand how coastal environments evolved in ...

or silt on the sea floor. Land animals and plants usually decomposed or were eaten, and mainly the hard parts -- teeth, bones, shells, or wood -- were preserved. Fossils can be formed in several ways.

Here you will find a concentrated version of the wonderful world of seashells, coral and shell fossils, from scientific displays of rare and highly prized specimens to vendors offering shells for ...