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Ptychopariida is a large, heterogeneous order of trilobite containing some of the most primitive species known. The earliest species occurred in th...

Ptychopariida is a large, heterogeneous order of trilobite containing some of the most primitive species known. The earliest species occurred in th...

Museum quality, 65 million years old, Mosasaur Fossil Skull from Morocco. Mosasaurs probably evolved from an extinct group of aquatic lizards known...

Allosaurus hand and Lower Arm: 155-150 Million Years Old /(Late-Jurassic) Morrison Formation, Montana. The first big meat-eating predator discovere...

This Tyrannosaurus Rex Tibia bone is from the Cretaceous Age. The lower leg bone was found in the Hell Creek Formation in Fort Peck, Montana. This ...