Trilobites were the first group of animals in the animal kingdom to develop complex eyes. Cambrian Period (about 500 million years ago). Trilobites lived in marine waters. Some trilobites could swim, and others burrowed or crawled around on muddy sea floors.

• Size: 6"
• Brass casts of tiny Elrathia kingii trilobite fossils from the Wheeler Shale in Utah, measuring 5/16" long
• Hand forged sterling silver cuff