The recent fossil which was discovered in Japan was the Unique
Mosasaur fossil last December 8, 2015. This was found after the discovery of
the Dinosaur relatives and first dinosaurs (Dec. 7, 2015) by the University of
Most possibly, these creatures existed during the Mesozoic
Era. Dinosaurs surround the planet for about 165 million years. In the Earth’s
history, this era is called the Mesozoic Era.