The early Jurassic period, known also as the Liassic epoch came about 176 to 200 million years ago and was divided in to the Hettangian age, the Sinemurian age, the Pliensbachian age, and the Toarcian age. The beginning of the Jurassic period saw a rise of the dinosaurs after the Triassic period saw the extinction of many of the animals that thrived during that time.
The early Jurassic period also brought a much warmer and wetter rainforest type of climate and as such it encouraged reptile expansion. The early Jurassic period saw a variety of other life as well including the Ammonites, marine reptiles and terrestrial animals. While the Triassic period saw the end of many creatures due to extinction it only saw the near extinction of Ammonoids. As the continents shifted during the early Jurassic period the initial continent break up was in motion and this wasn’t the only activity in the world’s oceans. Ammonoid life began to evolve. It did so so quickly that Ammonites alone can be used as markers of fossil zones.
Marine reptiles also saw the early Jurassic period as a prime time to evolve and Ichthyosaurs and Plesiosaurs continued to grow giving birth to new marine reptiles such as the Ichthyosaurus, Temnodontosaurus, Eurycleidus, Macroplata and Rhomaleosaurus. Terrestrial animals which made their appearance during the early Jurassic period include the Heterodontosaurids, Scelidosaurs, Tetanurae, Stegosaurs. Also showing their faces at this time were the smaller carnivores: Sphenosuchid and Protosuchid crocodilians, the new flying Pterosaur species and early mammals such as the Tritylodonts, Sphenodonts, and Lissamphibians.
The early Jurassic period also brought a much warmer and wetter rainforest type of climate and as such it encouraged reptile expansion. The early Jurassic period saw a variety of other life as well including the Ammonites, marine reptiles and terrestrial animals. While the Triassic period saw the end of many creatures due to extinction it only saw the near extinction of Ammonoids. As the continents shifted during the early Jurassic period the initial continent break up was in motion and this wasn’t the only activity in the world’s oceans. Ammonoid life began to evolve. It did so so quickly that Ammonites alone can be used as markers of fossil zones.
Marine reptiles also saw the early Jurassic period as a prime time to evolve and Ichthyosaurs and Plesiosaurs continued to grow giving birth to new marine reptiles such as the Ichthyosaurus, Temnodontosaurus, Eurycleidus, Macroplata and Rhomaleosaurus. Terrestrial animals which made their appearance during the early Jurassic period include the Heterodontosaurids, Scelidosaurs, Tetanurae, Stegosaurs. Also showing their faces at this time were the smaller carnivores: Sphenosuchid and Protosuchid crocodilians, the new flying Pterosaur species and early mammals such as the Tritylodonts, Sphenodonts, and Lissamphibians.
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