Jurassic
199- 145 mya
Life
Dinosaurs dominated most of the land. One of the organisms was dinosaurs. Some of the organisms that lived in the jurassic period are ferns, spinosaurus, plesiosaurs, echidnas, and lampreys.
Lampreys
Lampreys are jawless fish. After the adult lamprey spawns then they die.
Ferns
Ferns were used to support life in the jurassic period. Provided food for many plant eating organisms.
Spinosaurus
Spinosaurus was the largest Carnivorous Dinosaur. The Spinosaurus ruled most of the land except for the T-Rex.
Geography
The Jurassic time period consisted of 2 major oceans, the Pacific Ocean, and Tethys Ocean. The climate was hot and dry. At the beginning of the Jurassic, Earth's continents were still together, forming the supercontinent Pangea. Towards the end of the Jurassic the continents were beginning to drift apart. The atmospheric CO2 levels were five times higher than the present atmospheric level. There were a lot of rocks distributed throughout the land.
Asteroids
Asteroids are minor planets.
Early Jurassic
This is how the continents looked in the jurassic period.
Mass Extinction
65 million years ago there was a mass extinction of dinosaurs from asteroids.