Mosasaur
Mosasaurs (from Latin "Mosa" meaning the 'Meuse river', and Greek σαύρος "sauros" meaning 'lizard') are an extinct group of large marine reptiles containing 38 genera in total. Their first fossil remains were discovered in a limestone quarry at Maastricht on the Meuse in 1764. Mosasaurs probably evolved from an extinct group of aquatic lizards known as aigialosaurs in the Early Cretaceous. During the last 20 million years of the Cretaceous period (Turonian-Maastrichtian ages), with the extinction of the ichthyosaurs and pliosaurs, mosasaurs became the dominant marine predators. They became extinct as a result of the K-Pg event at the end of the Cretaceous period, about 66 million years ago.
Mahisagar district
In the early 1980s, palaeontologists stumbled upon dinosaur bones and fossils during a regular geological survey of Balasinor (originally in Kheda District, currently in Mahisagar after formation of the district in 2013), later identified as "Rajasaurus narmadensis" (Latin for "princely lizard from the Narmada Valley". It was the first dinosaur fossil discovery in India.