From the Cambrian period to the Quaternary period, take stock of the previous earth hegemons before

The name of the prehistoric giant fish shows how terrifying it is. It's about 10 meters long, and it evolved from a lizard on land. It is 21 meters long and weighs 40 tons.

In the ocean, the most ferocious predator is the strange shrimp. It is the ancestral species of centipedes and millipedes, and can exceed meters in length. It is an ancient creature with an obese body and is one of the few invertebrate carnivores found to date.

Top 10 Horror Creatures of the Cambrian Period: Grotesque Worms, Strange Shrimps, Obabin Sea Scorpions, Microvasa Worms, Otoya Worms, Fuxian Lake Bugs, Cheering Bugs, Prickly Creature, Hairy Collins Monsters, Lyrarapax Unguispinus

First, dinosaurs. Second, crocodiles. Third, piranhas. Especially piranhas, it's just that at that time, piranhas ate not people, but all kinds of low-level animals, which was very terrifying.

The 4.6 Billion Year Old Earth: The Long Precambrian Period, divided into six chapters, each of which deals with the 4.6 billion years of Earth's history; The precambrian period of up to 4 billion years is collectively referred to as the Precambrian; That is, the Cryptozoic Epoch, which also includes the Underworld, the Archean, and the Proterozoic of the Archives.

13.8 billion years ago, the universe was born from the big **, at this time the universe is full of high-density, high-temperature and high-pressure matter, the universe is exponentially expanding outward, this is the period of inflation With the continuous expansion of the universe, the temperature continues to decrease, 400 million years later, the basic liquid particles were born, thermonuclear reactions began to occur violently, and the first star was finally lit up in the dark universe.

In this way, billions of years have passed, in a molecular cloud formed by gases and solid particles in the universe, under the action of appropriate low temperature and high pressure, the matter continues to coalesce, and about 4.546 billion years ago, a small galaxy - the solar system - was formed, and the earth was born.

Jurassic Period:

The Jurassic period is about 200 million years old. The Jurassic is a geological slip age between the Triassic and Cretaceous, ranging from 199.6 million BC (with an error of 600,000 years) to 145.5 million years (with an error of 4 million years).

The Jurassic is the second epoch of the Mesozoic Era, which began with the Triassic-Jurassic extinction event. Although the rock markings of this period are very clear and clear, the exact time of their beginning and end, like other ancient geological epochs, cannot be determined with great precision. <>

Changes in the Earth over 4.6 billion years:

Geologists and paleontologists divide the strata into 5 generations and 12 epochs according to the order in which the strata are naturally formed. That is, the early Archean and Proterozoic (the Proterozoic contains one Sinian in or bent China), and the later Paleozoic, Mesozoic and Cenozoic epochs. The Paleozoic era is divided into Cambrian, Ordovician, Silurian period, Devonian, Carboniferous and Permian, a total of 7 epochs; The Mesozoic is divided into three periods: Triassic, Jurassic and Cretaceous. There are only two periods in the Cenozoic: the Tertiary and the Quaternary.

The Cambrian period is the geological epoch of the Great Explosion of Life on Earth.