地球历史(古生代)（Earth history (Paleozoic)）.doc

地球历史(古生代)（Earth history (Paleozoic)） Ii. Phanerozoic eon (540 million years ago - now) (1) Paleozoic (1) Cambrian period (5.43 -- 449 million years ago) The Cambrian is the beginning of Phanerozoic, the name of the ancient name of the Roman name Cambria, which was first studied in the region of wales. Chinese name is derived from the old Japanese use Chinese characters in Japanese transliteration of sino-japanese Cambrian (sino-japanese: カ ン ブ キ Roman word: kan bu ki). 1. The dominant world of the sea After 60 million years ago, or 60 million years after the formation of the panosia continent, the continent of panosia split into four continents: laurentian, the Baltic continent, the Siberian continent, the gondwana continent. The pan-oceanic island of panosia was divided and expanded. The Cambrian climate is warm, the sea level rises, and the shallow sea drowns the low land. This shallow sea has created extremely favorable conditions for the birth of new species. 2. Cambrian life big bang In the Cambrian period just after the beginning of the hundreds of millions of years, including almost all modern animal groups ancestors, a large number of multicellular organisms suddenly appeared, the biological evolution of the explosive event is known as the big bang Cambrian life. Shell skeleton, Marine invertebrates toward prosperity, benthic life they camp, in tiny algae and organic matter particles, for food, which is the most prosperous arthropod trilobites, so the Cambrian period is also known as the age of trilobites, followed by the arm to animals, ancient cup, echinoderms and gastropods. (2) ordovician (4.9 -- 438 million years ago) Ordovician (Ordovician) is a British geologist, c. rapp worth using Ordovices named in 1879, Ordovices is an ancient nation of wales Ordovician Japanese Chinese transliteration of the word is Ordovices. 1. The palaeogeographic In ordovician, many tensile fracture basin makes the ancient continent lauren josiah, polo, Siberia and the separa