2. Cryptogenesis is divided into Phanerozoic, Archean and Proterozoic.
3. Phanerozoic is divided into Paleozoic, Mesozoic and Cenozoic.
4. Paleozoic is divided into Cambrian, Ordovician, Silurian, Devonian, Carboniferous and Permian.
5. Mesozoic is divided into Triassic, Jurassic and Cretaceous.
6. Cenozoic is divided into Paleogene, Neogene and Quaternary.
At present, we belong to the last era of Quaternary and Cenozoic.
Extended data:
Naming source:
It all started with Nicholas Stena, a professor of anatomy and a bishop of Florence. Stena can be called a generalist. He is not only profound in anatomy, but also proficient in paleontology, crystallography and geology. Based on years of field investigation and summary, he put forward the first two of the three basic laws of stratigraphy:
Law of stratigraphic superposition: the oldest sedimentary rocks are always at the bottom of the stratum. The young strata are always above the old strata.
Law of lateral extension of strata: All strata have a certain degree of lateral extension. The strata seen in one place can be traced in another place if they are well extended.
Although he is proficient in paleontology, it is not that he discovered the third law of paleontology dating, otherwise it would not be called Smith Stratum now, but Stena Stratum. Yes, it was the British geologist william smith who put forward the paleontological dating method. Smith engaged in geodesy as an apprentice. After finishing school, it is catching up with the British coal mining boom, and it is essential to dig canals to transport coal. For the next six years, he was responsible for surveying and supervising a canal project.
There are excellent outcrops on both sides of the newly dug river, which shows Smith countless faces. Through the observation of these outcrop profiles, Smith found a special sign to identify them-fossils. No matter how the lithology changes, the order in which animal fossils appear on rock outcrops remains unchanged. Under the guidance of fossils, Smith published the geological map of England and Wales in 18 15. A year later, the paper "Identification of Strata with Biofossils" was published. Stratigraphy as a discipline was formally born.
References:
Baidu Encyclopedia-Geological Age