Living in Late Cretaceous period in Montana, North America, CORYTHOSAURUS, or helmet head, was a large hadrosaur, a duck-billed dinosaur. It had a toothless beak with rows of sharp teeth in the back of its mouth.The name Corythosaurus comes from its crest, which looks like a helmet worn by ancient soldiers. This crest was probably used to make a loud horn noise. Air from the animal's nostrils was forced through the crest making it vibrant loudly. It measured 33 ft. 8000 lbs.
Cave of the Crystals or Giant Crystal Cave is a cave connected to the Naica Mine 300 metres ft) below the surface, in Naica, Chihuahua, Mexico. The main chamber contains giant selenite crystals (gypsum, some of the largest natural crystals ever found.