Phanerozoic Eon：The Phanerozoic Eon is the time from about 540-542 million years ago until now. It begins with the Paleozoic Era, which in turn begins with the Cambrian period. The key defining feature of the Phanerozoic Eon has been the activity of multicellular animal and plant life. Originally the Phanerozoic Eon took its name because this was the eon when life became manifested
显生宙：距今有5.4亿年的一段地质时期，开始于古生代 (Paleozoic Era) 的寒武纪时期 (Cambrian period)。显生宙的命名来自这一地质时期开始有生命的迹象。其特点为多细胞动物和植物的衍生。可细分为古生代、中生代和新生代。
Paleozoic Era: Paleozoic Era is a major interval of geologic time that began 541 million years ago with the Cambrian explosion, an extraordinary diversification of marine animals, and ended about 252 million years ago with the Permian extinction, the greatest extinction event in Earth history. The major divisions of the Paleozoic Era are the Cambrian, Devonian and Permian.
Cambrian：The Cambrian was the first geological period of the Paleozoic Era. it Began about 600 million years ago and brought about a surge of macroscopic species. It also produced a large amount of fossil records, like trilobite, opabinia, and anomalocaridids.
Devonian: Devonian Period is an interval of the Paleozoic Era, spanning between about 419.2 million and 358.9 million years ago. It is sometimes called the “Age of Fishes” because of the diverse, abundant, and, in some cases, bizarre types of these creatures that swam Devonian seas. Late in the period the first four-legged amphibians appeared, indicating the colonization of land by vertebrates.
Permian: Permian Period is the last period of the Paleozoic Era. It began 298.9 million years ago and ended 252.2 million years ago. At the beginning of the period, there was just one big continent. As the climate warmed up, plant and animal species began to diversify profusely. So life during the Permian Period was abundant and diverse. However, by the end of the period, hot and dry conditions were so extensive that they caused a crisis in Permian marine and terrestrial life, also known as the Permian Extinction
Mesozoic Era: The Mesozoic Era is divided into the Triassic, Jurassic, and Cretaceous periods. It spread over an interesting time that witnessed splitting of the Pangaea supercontinent and the opening and spreading of the Atlantic and Indian oceans. It saw the evolution of the dinosaurs, the first mammals, early birds and the flowering plants.
Triassic：The Triassic Period represents the transition from the Late Palaeozoic icehouse to the later Mesozoic greenhouse and was characterized by a relatively warm climate. In fact, it was conventionally considered as one of the warmest periods in Earth history. It is the time during which the world fauna changed drastically from that which had been seen in the Paleozoic. Dinosaurs, which are perhaps the most popular organisms of the Mesozoic, evolved in the Triassic
Jurassic: The Jurassic period was a geologic period in the middle of the Mesozoic. It extends from about 200 million years ago to 145 million years ago. During the Jurassic period, the dinosaurs continued their dominance of the land, while marine reptiles such as ichthyosaurs, plesiosaurs and marine crocodiles occupied the sea. During the Jurassic period, the world got progressively warmer and wetter, allowing for more forests on the continent Pangaea.
Cretaceous：Cretaceous Period was the last of the three periods of the Mesozoic Era. The Cretaceous began 145.0 million years ago and ended 66 million years ago; it followed the Jurassic Period and was succeeded by the Paleogene Period. The Cretaceous is the longest period of the Phanerozoic Eon. Spanning 79 million years. Over these years seas were elevated, spreading over large continental areas. The Cretaceous ended with one of the greatest mass extinctions in the history of Earth, exterminating the dinosaurs, marine and flying reptiles, and many marine invertebrates.
Cenozoic：The Cenozoic Era is the current geologic era of the Phanerozoic Eon and extends from 65.5 million years ago to the present. The Cenozoic is best known for the appearance and diversification of modern mammals and birds. Grasslands first appear in the Cenozoic and greatly influenced the evolution of many mammals. Humans first appear during the latter part of this Era. It is divided into three geologic periods that include the Paleogene, Neogene and Quaternary.
Pleistocene & Holocene: The Quaternary Period is the current geologic period of the Cenozoic Era. The Quaternary Period is subdivided into the Pleistocene and Holocene Epochs. The Pleistocene Epoch is defined by repeated periods of glaciation. During this time intense periods of glaciation lasting up to 100,000 years, alternated with warmer interglacial periods of 20,000 to 30,000 years. Continental glaciers during this time reached latitudes as far as 40 degrees. Many large mammals that flourished during this time went extinct at the end of the Pleistocene around 11,700 years ago. The Holocene or present epoch represents an interglacial period. Fossils recognizable as human appear during the Quaternary Period.