The Return of Cambrian Period

In the history of geology, more than 500 million years ago, there was a period of the Paleozoic Era known as the Cambrian Period. This period, being the first period of the Paleozoic Era, does not only have a significant meaning for geological research, but is also the most insane, splendid and mysterious period in paleontological history. Before the Cambrian Period, the Earth’s species were relatively monotonous. When the Cambrian Period started, just after millions of years, which is a relatively short period of time in terms of geology, all kind of species on Earth suddenly evolved wildly. Countless invertebrates, arthropods, mollusks, brachiopods, annelids, etc. appeared on the planet w...