Trilobites were an incredible group of marine animals that first appeared at the beginning of the Cambrian Period, about 542 million years ago. These creatures dominated the seas for millions of years and left behind an incredible fossil record that provides insights into the evolution of life on Earth. The name "trilobite" comes from the three lobes that run the length of … [Read more...] about Trilobites: Ancient Marine Creatures that Dominated the Seas