geologic timescale

The Cambrian is a major division of the geologic timescale that begins about 542 Ma (million years ago) at the end of the Proterozoic eon and ended about 488.3 Ma with the beginning of the Ordovician period (ICS, 2004). It is the first period of the Paleozoic era of the Phanerozoic eon. The Cambrian is the earliest period in whose rocks are found numerous large, distinctly-fossilizable multicellular organisms that are more complex than sponges or medusoids. During this time, roughly fifty separate major groups of organisms or "phyla" ...

Including:

• Cambrian - Origin
• Cambrian - Cambrian subdivisions
• Cambrian - Cambrian dating
• Cambrian - Cambrian palaeogeography
• Cambrian - Cambrian fauna

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Age may refer to: The length of time that a person has lived: ageing, for the social, cultural, and economic factors of age and ageing. senescence, for the biology and science of ageing. A period of history: list of time periods three-age system geologic timescale astrological age Other: A command used in 2channel, a foremost BBS in Japan Age, Mie, a district in Japan One of the D'ni Ages, the fictional un ...

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In the geologic timescale, Berriasian is a stage of the Lower Cretaceous epoch. It spanned between 145.5 Ma and 140.2 Ma (million years ago). The Berriasian stage succeeds the Tithonian stage of the Upper Jurassic epoch and precedes the Valanginian stage of the Lower Cretaceous epoch. Other related archivesLower Cretaceous, Ma, Tithonian, Upper Jurassic, Valanginian, epoch, geologic timescale, stage

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The Carboniferous is a major division of the geologic timescale that extends from the end of the Devonian period, about 359.2 Ma (million years ago), to the beginning of the Permian period, about 299.0 Ma (ICS 2004). As with most older geologic periods, the rock beds that define the period's start and end are well identified, but the exact dates are uncertain by 5–10 million years. The Carboniferous is named for the extensive coal beds of that age found in Great Britain and Western Europe. The first third of the Carboniferous is cal ...

Including:

• Carboniferous - Subdivisions
• Carboniferous - Gzhelian most recent
• Carboniferous - Kasimovian
• Carboniferous - Moscovian
• Carboniferous - Bashkirian/Morrowan
• Carboniferous - Serpukhovian
• Carboniferous - Visean
• Carboniferous - Tournaisian oldest
• Carboniferous - Paleogeography
• Carboniferous - Rocks and coal
• Carboniferous - Life

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In the geologic timescale, the Anisian is the age of the Middle Triassic epoch of the Triassic period of the Mesozoic era of the Fanerozoic eon that is comprehended between 245 million and 237 million years ago, approximatedly. The Anisian age succeeds the Olenekian age of the Lower Triassic epoch of its own period and precedes the Ladinian age of the Middle Triassic epoch. Other related archivesLadinian, Mesozoic, Middle Triassic, Olenekian, Triassic, age, eon, era, geologic ti

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Aptian stage is a faunal of the Lower Cretaceous epoch in the geologic timescale, that is comprehended between 125 Ma and 112 Ma (million years ago), approximately. The Aptian stage succeeds the Barremian stage and precedes the Albian stage, all in the same epoch. Other related archivesAlbian, Barremian, Lower Cretaceous, Ma, epoch, faunal, geologic timescale

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The Cretaceous period is one of the major divisions of the geologic timescale, reaching from the end of the Jurassic period, about 146 million years ago (Ma), to the beginning of the Paleocene epoch of the Tertiary period (65.5 Ma). The end of the Cretaceous also defines the boundary between the Mesozoic and Cenozoic eras. Cretaceous - Name and dating. As with other older geologic periods, the rock beds that define the Cretaceous are well identified, but the exact dates of the pe ...

Including:

• Cretaceous - Name and dating
• Cretaceous - Divisions
• Cretaceous - Paleogeography
• Cretaceous - Flora
• Cretaceous - Fauna
• Cretaceous - Land animals
• Cretaceous - Marine animals
• Cretaceous - Extinction
• Cretaceous - References and further reading

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In the geologic timescale, the Bathonian is the age of the Middle Jurassic epoch of the Jurassic period of the Mesozoic era of the Phanerozoic eon that is comprehended between 167 million 700 thousand and 164 million 700 thousand years ago, approximatedly. The Bathonian age succeeds the Bajocian age and precedes the Callovian age, all in the same epoch. ...

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The Aalenian is a subdivision of the Middle Jurassic period of the geologic timescale that extends from about 175.6 Ma to about 171.6 Ma (million years ago). It was preceded by the Toarcian era and succeeded by the Bajocian. Other related archivesBajocian, Ma, Middle Jurassic, Toarcian, geologic timescale

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In the geologic timescale, the Artinskian is the age of the Cisuralian epoch of the Permian period of the Paleozoic era of the Phanerozoic eon that is comprehended between 284 million 400 thousand and 275 million 600 thousand years ago, approximatedly. The Artinskian age succeeds the Sakmarian age and precedes the Kungurian age, all in the same epoch. Category: Permian ...

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In the geologic timescale, the Bashkirian is the age of the Pennsylvanian epoch of the Carboniferous period of the Paleozoic era of the Phanerozoic eon that is comprehended between 318 million 100 thousand and 311 million 700 thousand years ago, approximatedly. The Bashkirian age succeeds the Serpukhovian age of the Mississippian epoch of the same period and precedes the Moscovian age of the Pennsylvanian epoch. Categories: Cleanup from October 2005 | Carboni ...

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In the geologic timescale, the Bajocian is the age of the Middle Jurassic epoch of the Jurassic period of the Mesozoic era of the Phanerozoic eon that is comprehended between 171 million 600 thousand and 167 million 700 thousand years ago, approximatedly. The Bajocian age succeeds the Aalenian age and precedes the Bathonian age, all in the same epoch. ...

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These pages contain the trends of millennia and centuries. The individual century pages contain lists of decades and years. See history for different organizations of historical events. See calendar and list of calendars for other groupings of years. For earlier time periods, see cosmological timeline, geologic timescale, evolutionary timeline, pleistocene, and logarithmic timeline. Paleolithic 10th millennium BC | 9th millennium BC | 8th millennium BC 7th millennium BC ...

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The Silurian is a major division of the geologic timescale that extends from the end of the Ordovician period, about 443.7 Ma (million years ago), to the beginning of the Devonian period, about 416.0 Ma (ICS 2004). 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 5-10 million years. The base of the Silurian is set at a major extinction event where 60% of marine species were wiped out. See Ordov ...

Including:

• Silurian - Historiography
• Silurian - Silurian subdivisions
• Silurian - Silurian paleogeography
• Silurian - Silurian biota
• Silurian - Source

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The Jurassic period is a major unit of the geologic timescale that extends from about 200 Ma (million years ago) at the end of the Triassic to 146 Ma at the beginning of the Cretaceous. As with other geologic periods, the rock beds that define the start and end of the period are well identified, but the exact dates are uncertain by 5 - 10 million years. The Jurassic constitutes the middle period of the Mesozoic era, also k ...

Including:

• Jurassic - Divisions
• Jurassic - Paleogeography
• Jurassic - Aquatic and Marine Animals
• Jurassic - Terrestrial Animals
• Jurassic - Plants
• Jurassic - Popular culture

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The Eocene epoch (56-34 Ma) is a major division of the geologic timescale and the second epoch of the Palaeogene period in the Cenozoic era. The Eocene spans the time from the end of the Paleocene epoch to the beginning of the Oligocene epoch. The start of the Eocene is marked by the emergence of the first modern mammals. The end is set at a major extinction event that may be related to the impact of one or more large bolides in Siberia and in what is now Chesapeake Bay. Still, as with other other geologic periods, the strata that define the start and end of the epoch are well identified, ...

Including:

• Eocene - Eocene subdivisions
• Eocene - Eocene climate
• Eocene - Eocene paleogeography
• Eocene - Eocene flora
• Eocene - Eocene fauna
• Eocene - Eocene oceans

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A continent (Latin continere, "to hold together") is a large continuous land mass. There are several conceptions of what a continent is, geographic, geologic, and tectonic. Continent - Geographic continents. Since geography is defined by local convention, there are several conceptions as to which landmasses qualify as continents, and which might be termed supercontinents (e.g. Africa-Eurasia), microcontinents (e.g. Madagascar or New Zealand), or subcontinents (e. ...

Including:

• Continent - Geographic continents
• Continent - Geologic continents
• Continent - Tectonic plates

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Stage has several meanings: Stage (theatre), the area where actors perform. Stage is often used as a more general term to refer to anything relating to the creation of performance art. Stage (bicycle race), a one-day segment of a multi-day race. The entire race is sometimes called a stage race. Faunal stage, a subdivision of time on the geologic timescale. Marine isotopic stage, an ancient climate variant. In Staging (rocketry), one of several independent rockets used to r

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The Pleistocene Epoch is part of the geologic timescale. The name of the pleistocene is derived from the Greek pleistos (most) and ceno (new). The Pleistocene follows the Pliocene epoch and is followed by the Holocene epoch. The Pleistocene is the third epoch of the Neogene period or 6th epoch of the Cenozoic era. The end of the Pleistocene corresponds with the end of the ...

Including:

• Pleistocene - Pleistocene dating
• Pleistocene - Pleistocene paleogeography and climate
• Pleistocene - Glacial features
• Pleistocene - Major events
• Pleistocene - Palaeocycles
• Pleistocene - Pleistocene fauna
• Pleistocene - Pleistocene deposits

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In the geologic timescale, the Asselian is the age of the Cisuralian epoch of the Permian period of the Paleozoic era of the Phanerozoic eon that is comprehended between 299 million and 294 million 600 thousand years ago, approximatedly. The Asselian age succeeds the Gzhelian age of the Pennsylvanian epoch of the Carboniferous period and precedes the Sakmarian age of the Cisuralian epoch. Category: Permian ...

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