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light weight
including at least twenty partial to complete skulls
Late Jurassic
Following the global mass extinction at the Silurian boundary
Acrocanthosaurus, claw of hand Pachycephalosaurus light weightAcrocanthosaurus (meaning "high spine lizard" because of the spikes growing out of its spine) was a fierce predator that was roughly 30 40 feet (9 12 m) long and weighed about 5,000 pounds (2300 kg). It had a big head, with a 4. 5 foot (1. 4 m) long skull and 68 thin, sharp, serrated teeth. It had 17 inch (43 cm) spikes extending from its vertebrae, along the neck and tail that may have formed a thick, fleshy sail on its back. It had powerful arms,