The Mesozoic Era is identified as the period during which dinosaurs flourished. For convenience of classification, it is divided into three sub-periods: the triassic from 251 - 199.6 MYA (MYA = millions of years ago); the Jurassic 199.6 - 145,5 MYA, when really large dinosaurs were a feature of the landscape; and cretaceous from 145.5 - 65.5 MYA.
As with the Allosaurus, Stegosaurus (covered lizard) lived during the late Jurassic period - 155 - 145 MYA.
It was a herbivore (veg in Indian restaurant terms). It had a tiny brain, and a toothless beak. It carried its head close to the ground for grazing, the latter facilitated by short forelimbs. Its maximum speed over the ground was 6 to 7 kilometres per hour. While it could grow to 12 metres in length, the average was 7 - 9 metres. It weighed up to 5,000 kgs.
As to its name - Stegosaurus - this refers to the 17 dermal plates on its back made of bone that act like armour. It had a spiked tail held high in the air.
This photograph was taken at the Indodra Fossil and Dinosaur Park in Gandhinagar.