Crawling from a primordial sea near you— trilobites! Trilobites are the iconic image of fossils and fossil collecting. Legions of trilobites prowled the ancient seas for more than 270 million years. Trilobites are at once instantly recognized, mysterious, extinct and prized by both collectors and designers for their innate artistry. Collectors find trilobite fossils worldwide and trilobites are among the most sought after fossils. Butter Side Down Stamps celebrates the wonder of the trilobite with our highly popular Trilobite Collection.