Prehistoric Life Prehistoric Secrets in Stone The Earliest Fossils The Silurian Reef Trilobites Fish The Coal Forests Early Reptiles and Amphibians Sea Reptiles Flying Reptiles The Teeming Seas Hunting Dinosaurs Biggest Dinosaurs Two-Footed Plant Eaters Plated and Armoured Dinosaurs Horned Dinosaurs The Mammal Age Dawns Grassland Mammals The Ice Age	Belemnites Related to the ammonites were the belemnites. These looked like squid but had pencil-shaped internal shells that are often found as fossils.   Previous: Back Book: Prehistoric Life Section: Prehistoric Chapter: The Teeming Seas