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Triassic
The TRIASSIC ( /traɪˈæsɪk/ ) is a geologic period and system which spans 50.9 million years from the end of the Permian Period 252.17 million years ago (Mya ), to the beginning of the Jurassic Period 201.3 Mya. The Triassic is the first period of the Mesozoic Era . Both the start and end of the period are marked by major extinction events . The Triassic began in the wake of the Permian– Triassic extinction event , which left the earth's biosphere impoverished; it would take well into the middle of this period for life to recover its former diversity. Therapsids and archosaurs were the chief terrestrial vertebrates during this time. A specialized subgroup of archosaurs , called dinosaurs , first appeared in the Late Triassic but did not become dominant until the succeeding Jurassic Period
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Precambrian
The PRECAMBRIAN (or PRE-CAMBRIAN, sometimes abbreviated PЄ, or CRYPTOZOIC) is the earliest period of Earth\'s history , set before the current Phanerozoic
Phanerozoic
Eon. The Precambrian
Precambrian
is so named because it preceded the Cambrian, the first period of the Phanerozoic
Phanerozoic
eon, which is named after Cambria
Cambria
, the Latinised name for Wales
Wales
, where rocks from this age were first studied. The Precambrian
Precambrian
accounts for 88% of the Earth's geologic time. The Precambrian
Precambrian
(colored green in the timeline figure) is a supereon that is subdivided into three eons (Hadean, Archean, Proterozoic) of the geologic time scale
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Cambrian
The CAMBRIAN Period ( /ˈkæmbriən/ or /ˈkeɪmbriən/ ) was the first geological period of the Paleozoic Era, of the Phanerozoic Eon. The Cambrian lasted 55.6 million years from the end of the preceding Ediacaran Period 541 million years ago (mya) to the beginning of the Ordovician Period 485.4 mya. Its subdivisions, and its base, are somewhat in flux. The period was established (as “Cambrian series”) by Adam Sedgwick , who named it after Cambria , the Latinised form of _Cymru_, the Welsh name for Wales , where Britain's Cambrian rocks are best exposed. The Cambrian is unique in its unusually high proportion of lagerstätte sedimentary deposits, sites of exceptional preservation where "soft" parts of organisms are preserved as well as their more resistant shells
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Ordovician
The ORDOVICIAN ( /ɔːrdəˈvɪʃən/ ) is a geologic period and system , the second of six periods of the Paleozoic Era . The Ordovician
Ordovician
spans 41.2 million years from the end of the Cambrian Period 485.4 million years ago (Mya) to the start of the Silurian Period 443.8 Mya. The Ordovician, named after the Celtic tribe of the Ordovices , was defined by Charles Lapworth
Charles Lapworth
in 1879 to resolve a dispute between followers of Adam Sedgwick and Roderick Murchison
Roderick Murchison
, who were placing the same rock beds in northern Wales into the Cambrian
Cambrian
and Silurian periods, respectively. Lapworth recognized that the fossil fauna in the disputed strata were different from those of either the Cambrian or the Silurian periods, and placed them in a period of their own
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Silurian
The SILURIAN is a geologic period and system spanning 24.6 million years from the end of the Ordovician Period, at 443.8 million years ago (Mya ), to the beginning of the Devonian Period, 419.2 Mya. As with other geologic periods, the rock beds that define the period's start and end are well identified, but the exact dates are uncertain by several million years. The base of the Silurian is set at a major Ordovician-Silurian extinction event when 60% of marine species were wiped out. A significant evolutionary milestone during the Silurian was the diversification of jawed and bony fish. Multi-cellular life also began to appear on land in the form of small, bryophyte -like and vascular plants that grew beside lakes, streams, and coastlines, and terrestrial arthropods are also first found on land during the Silurian. However, terrestrial life would not greatly diversify and affect the landscape until the Devonian
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Devonian
The DEVONIAN is a geologic period and system of the Paleozoic , spanning 60 million years from the end of the Silurian , 419.2 million years ago (Mya), to the beginning of the Carboniferous , 358.9 Mya. It is named after Devon , England , where rocks from this period were first studied. The first significant adaptive radiation of life on dry land occurred during the Devonian. Free-sporing vascular plants began to spread across dry land , forming extensive forests which covered the continents . By the middle of the Devonian, several groups of plants had evolved leaves and true roots, and by the end of the period the first seed-bearing plants appeared. Various terrestrial arthropods also became well-established. Fish reached substantial diversity during this time, leading the Devonian to often be dubbed the "AGE OF FISH"
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Carboniferous
The CARBONIFEROUS is a geologic period and system that spans 60 million years from the end of the Devonian Period 358.9 million years ago (Mya ), to the beginning of the Permian Period, 298.9 Mya. The name _Carboniferous_ means "coal-bearing" and derives from the Latin words _carbō_ ("coal ") and _ferō_ ("I bear, I carry"), and was coined by geologists William Conybeare and William Phillips in 1822. Based on a study of the British rock succession, it was the first of the modern 'system' names to be employed, and reflects the fact that many coal beds were formed globally during that time. The Carboniferous is often treated in North America as two geological periods, the earlier Mississippian and the later Pennsylvanian . Terrestrial life was well established by the Carboniferous period
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Permian
The PERMIAN is a geologic period and system which spans 46.7 million years from the end of the Carboniferous Period 298.9 million years ago (Mya ), to the beginning of the Triassic Period 252.2 Mya. It is the last period of the Paleozoic Era; the following Triassic Period belongs to the Mesozoic Era. The concept of the Permian was introduced in 1841 by geologist Sir Roderick Murchison , who named it after the city of Perm . The Permian witnessed the diversification of the early amniotes into the ancestral groups of the mammals , turtles , lepidosaurs , and archosaurs . The world at the time was dominated by two continents known as Pangaea and Siberia , surrounded by a global ocean called Panthalassa . The Carboniferous rainforest collapse left behind vast regions of desert within the continental interior
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Jurassic
The JURASSIC ( /dʒuːˈræsɪk/ ; from Jura Mountains ) was a geologic period and system that spanned for 56 million years from the end of the Triassic Period 201.3 million years ago (Mya ) to the beginning of the Cretaceous Period 145 Mya. The Jurassic constituted the middle period of the Mesozoic Era , also known as the Age of Reptiles. The start of the period was marked by the major Triassic–Jurassic extinction event . Two other extinction events occurred during the period: the Pliensbachian/ Toarcian event in the Early Jurassic, and the Tithonian event at the end; however, neither event ranks among the "Big Five" mass extinctions
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Cretaceous
The CRETACEOUS ( /krᵻˈteɪʃəs/ , _krə-TAY-shəs_ ) is a geologic period and system that spans 79 million years from the end of the Jurassic Period 145 million years ago (mya ) to the beginning of the Paleogene Period 66 mya. It is the last period of the Mesozoic Era . The Cretaceous Period is usually abbreviated K, for its German translation _Kreide_ (chalk). The Cretaceous was a period with a relatively warm climate , resulting in high eustatic sea levels that created numerous shallow inland seas . These oceans and seas were populated with now-extinct marine reptiles , ammonites and rudists , while dinosaurs continued to dominate on land. During this time, new groups of mammals and birds , as well as flowering plants , appeared
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Paleogene
The PALEOGENE ( /ˈpæliːədʒiːn/ or /ˈpeɪliːədʒiːn/ ; also spelled PALAEOGENE or PALæOGENE; informally LOWER TERTIARY) is a geologic period and system that spans 43 million years from the end of the Cretaceous
Cretaceous
Period 66 million years ago (Mya ) to the beginning of the Neogene
Neogene
Period 23.03 Mya. It is the beginning of the Cenozoic
Cenozoic
Era of the present PhanerozoicEon. The Paleogene
Paleogene
is most notable for being the time during which mammals diversified from relatively small, simple forms into a large group of diverse animals in the wake of the Cretaceous–Paleogene extinction event
Cretaceous–Paleogene extinction event
that ended the preceding Cretaceous
Cretaceous
Period
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Neogene
The NEOGENE ( /ˈniːəˌdʒiːn/ ) is a geologic period and system that spans 20.45 million years from the end of the Paleogene Period 23.03 million years ago (Mya ) to the beginning of the present Quaternary Period 2.58 Mya. The Neogene is sub-divided into two epochs , the earlier Miocene and the later Pliocene . Some geologists assert that the Neogene cannot be clearly delineated from the modern geological period, the Quaternary . During this period, mammals and birds continued to evolve into roughly modern forms, while other groups of life remained relatively unchanged. Early hominids , the ancestors of humans, appeared in Africa near the end of the period. Some continental movement took place, the most significant event being the connection of North and South America at the Isthmus of Panama , late in the Pliocene
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Oxygen
OXYGEN is a chemical element with symbol O and atomic number 8. It is a member of the chalcogen group on the periodic table and is a highly reactive nonmetal and oxidizing agent that readily forms oxides with most elements as well as other compounds . By mass, oxygen is the third-most abundant element in the universe, after hydrogen and helium . At standard temperature and pressure , two atoms of the element bind to form dioxygen , a colorless and odorless diatomic gas with the formula O 2. This is an important part of the atmosphere and diatomic oxygen gas constitutes 20.8% of the Earth\'s atmosphere . Additionally, as oxides the element makes up almost half of the Earth\'s crust
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Carbon Dioxide
CARBON DIOXIDE (chemical formula CO2) is a colorless gas with a density about 60% higher than that of air (1.225 g/L) that is odorless at normally encountered concentrations. Carbon dioxide consists of a carbon atom covalently double bonded to two oxygen atoms. It occurs naturally in Earth\'s atmosphere as a trace gas at a concentration of about 0.04 percent (400 ppm ) by volume. Natural sources include volcanoes , hot springs and geysers , and it is freed from carbonate rocks by dissolution in water and acids. Because carbon dioxide is soluble in water, it occurs naturally in groundwater , rivers and lakes , ice caps , glaciers and seawater . It is present in deposits of petroleum and natural gas
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Parts Per Million
In science and engineering , the PARTS-PER NOTATION is a set of pseudo-units to describe small values of miscellaneous dimensionless quantities , e.g. mole fraction or mass fraction . Since these fractions are quantity-per-quantity measures, they are pure numbers with no associated units of measurement . Commonly used are PPM (parts-per-million, 10−6), PPB (parts-per-billion, 10−9), PPT (parts-per-trillion, 10−12) and PPQ (parts-per-quadrillion, 10−15). CONTENTS* 1 Overview * 1.1 In nuclear magnetic resonance (NMR) spectroscopy * 2 Parts-per expressions * 3 Criticism * 3.1 Long and short scales
Long and short scales
* 3.2 Thousand vs. trillion * 3.3 Mass fraction vs. mole fraction vs
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Paleozoic
The PALEOZOIC (or PALAEOZOIC) ERA ( /ˌpeɪliəˈzoʊɪk, ˌpæ-/ ; from the Greek _palaios_ (παλαιός), "old" and _zoe_ (ζωή), "life", meaning "ancient life" ) is the earliest of three geologic eras of the Phanerozoic Eon. It is the longest of the Phanerozoic eras, lasting from 541 to 252.17 million years ago , and is subdivided into six geologic periods (from oldest to youngest): the Cambrian , Ordovician , Silurian ,