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They typically feed on smaller fish and invertebrates
are interpreted as body fossils of unknown affinities rather than trace fossils
75 million years ago and had characteristics distinctive of the robust australopithecines Paranthropus boisei proved to be a treasure
Morrison Formation of Moffat County
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Acrocanthosaurus, claw of foot Triceratops They typically feed on smallerAcrocanthosaurus (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,