Stegosaurus existed from about 155 to 150 million years ago. That was during the Kimmeridgian and Tithonian stages of the Jurassic period.

Stegosaurus existed from about 155 to 150 million years ago. That was during the Kimmeridgian and Tithonian stages of the Jurassic period. The Jurassic was the second period of the Mesozoic era.

Pterodactylus existed between 150.8 and 148.5 million years ago. That was during the Tithonian stage of the Jurassic period.

Pterodactylus fossils are known from between 150.8 to 148.5 million years ago. This was during the Tithonian stage of the late Jurassic period, the second period of the Mesozoic era.

Apatosaurus excelsus existed from about 154 to 151 million years ago. This was during the Kimmeridgian and Tithonian stage of the Jurassic period.