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

ancient animal archeology arthropod background barrande biology brown closeup color concrete copy dead era evolution extinct fossil fossilization fossilized fossils geological geology grey history limestone macro marble marine mineral mountain museum natural nature ocean old paleoart paleontology prehistoric prehistory rock rough science shale skeleton space spiral stone textured trilobite