ancient trilobites in a stone. 500 million year old trilobite. trilobites meaning three lobes are a fossil group of

ancient animal archeology arthropod background biology brown closeup color concrete copy earth evolution evolve exoskeleton extinct fossil fossiled fossilization fossilized fossils geological geology history limestone marble mineral mountain museum natural nature ocean old paleontologist paleontology pattern prehistoric prehistory rock rough sand science sea stone trilobite trilobites vintage