A geologic period is a subdivision of geologic time that divides an era into smaller timeframes. The geologic time scale is a chronologic schema (or idealized Model) relating Stratigraphy to time that is used by Geologists and other The equivalent term used to demarcate rock layers and the fossil record is the system; thus the rocks of the Devonian System were laid down during the Devonian Period. In Geology and related fields a stratum (plural strata) is a layer of rock or Soil with internally consistent characteristics that distinguishes FOSSIL is a standard protocol for allowing serial communication for Telecommunications programs under the DOS Operating system. While paleontologists often refer to faunal stages rather than geologic periods, they are often used in popular presentations of paleontology. Palaeontology redirects here For the Scientific journal, see Palaeontology (journal. Such references include the book and movie Jurassic Park. A Book is a set or collection of written printed illustrated or blank sheets made of Paper, Parchment, or other material usually fastened together Jurassic Park is a Science fiction Novel that was written by Michael Crichton and published in 1990.
As illustrated in the article on the geologic time scale, most periods are subdivided into smaller units called epochs. The geologic time scale is a chronologic schema (or idealized Model) relating Stratigraphy to time that is used by Geologists and other The geologic time scale is a chronologic schema (or idealized Model) relating Stratigraphy to time that is used by Geologists and other In 2004 the International Union of Geological Sciences (I. The International Union of Geological Sciences (IUGS is an international Non-governmental organization devoted to international cooperation in the field of Geology U. G. S. ) recognized the Ediacaran period of the Neoproterozoic era, the first such newly-designated period in 130 years. The Ediacaran Period (ˌiːdiˈækərən named after the Ediacara Hills of South Australia) is the last geological period of the Neoproterozoic The Neoproterozoic Era is the unit of geologic time from 1000 to 542 +/- 0
| Eon | Era | Period | Start, Million Years Ago |
|---|---|---|---|
| Phanerozoic | Cenozoic | Neogene† (Miocene/Pliocene/Pleistocene/Holocene) | 23. The Precambrian ( Pre-Cambrian) is an informal name for the supereon comprising the eons of the Geologic timescale that came before the current The Cambrian is a geologic period and system that began about Ma (million years ago at the end of the Proterozoic eon and ended about Ma with The Ordovician is a geologic period and system, the second of six of the Paleozoic era, and covers the time between 488 The Silurian is a geologic period and system that extends from the end of the Ordovician period about 443 The Devonian is a geologic period and system of the Paleozoic era spanning from to million years ago. The Carboniferous is a geologic period and system that extends from the end of the Devonian period about 359 The Permian is a geologic period and system that extends from 299 The Triassic is a geologic period and system that extends from about 251 to 199 Ma (million years ago The Jurassic is a geologic period and system that extends from about Ma (million years ago to Ma that is from the end of the Triassic to the beginning The Cretaceous (kriːˈteɪʃəs, usually abbreviated 'K' for its German translation "Kreide" is a geologic period and system, reaching from the end of The Paleogene (alternatively Palaeogene) is a geologic period and system that began 65 The Neogene is a geologic period and system starting 2303 ± 0 The Phanerozoic (occasionally Phanaerozoic) Eon is the current eon in the Geologic timescale, and the one during which abundant animal life has existed The Cenozoic (also Caenozoic or Cainozoic) Era (ˌsiːnəˈzoʊɪk/ /ˌsɛn- (meaning "new life" ( Greek ( kainos) "new" The Neogene is a geologic period and system starting 2303 ± 0 0 |
| Paleogene (Paleocene/Eocene/Oligocene) | 65. The Paleogene (alternatively Palaeogene) is a geologic period and system that began 65 5 | ||
| Mesozoic | Cretaceous | 145. The Mesozoic Era is one of three geologic eras of the Phanerozoic eon. The Cretaceous (kriːˈteɪʃəs, usually abbreviated 'K' for its German translation "Kreide" is a geologic period and system, reaching from the end of 5 | |
| Jurassic | 200 | ||
| Triassic | 251 | ||
| Paleozoic | Permian | 300 | |
| Carboniferous (Mississippian/Pennsylvanian) | 359 | ||
| Devonian | 416 | ||
| Silurian | 444 | ||
| Ordovician | 488 | ||
| Cambrian | 542 | ||
| Proterozoic | Neoproterozoic | Ediacaran | 630 |
†Some Geologists still designate a third period, or "sub-era", of the Cenozoic Era called the Quaternary, comprising the last two epochs of the Neogene Period and extending up to the present. The Jurassic is a geologic period and system that extends from about Ma (million years ago to Ma that is from the end of the Triassic to the beginning The Triassic is a geologic period and system that extends from about 251 to 199 Ma (million years ago The Paleozoic or Palaeozoic Era (from the Greek palaio (παλαιο "old" and zoe (ζωη "life" meaning "ancient life" The Permian is a geologic period and system that extends from 299 The Carboniferous is a geologic period and system that extends from the end of the Devonian period about 359 The Devonian is a geologic period and system of the Paleozoic era spanning from to million years ago. The Silurian is a geologic period and system that extends from the end of the Ordovician period about 443 The Ordovician is a geologic period and system, the second of six of the Paleozoic era, and covers the time between 488 The Cambrian is a geologic period and system that began about Ma (million years ago at the end of the Proterozoic eon and ended about Ma with The Proterozoic (ˌproʊtərəˈzoʊɪk is a geological eon representing a period before the first abundant complex life on Earth. The Neoproterozoic Era is the unit of geologic time from 1000 to 542 +/- 0 The Ediacaran Period (ˌiːdiˈækərən named after the Ediacara Hills of South Australia) is the last geological period of the Neoproterozoic Overview The term Quaternary ("fourth" was proposed by Giovanni Arduino in 1759 for alluvial deposits in the Po river valley in northern
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