Carboniferous

Carboniferous

Carboniferous

Sharks and Fish

Sharks and Fish

Shark, any of numerous species of cartilaginous fishes of predatory habit that constitute the order Selachii (class Chondrichthyes).

Trilobites

Trilobites

Trilobite, any member of a group of extinct fossil arthropods easily recognized by their distinctive three-lobed, three-segmented form.