macro photo of an echinodermata blastoid

blastoids echinodermata fosils carboniferous fossil spines copy space isolated white background geology plate triangle shape shapes geometry lines macro material pattern parallel perspective stone symmetry textures close closeup top view triangular single horizontal negative depth field symmetrical extinct petrified echinoderms prehistory invertebrate paleozoic mineral details paleontology ancient arthropod blastoid blastoid high focus