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Encyclopedia > Aalenian
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The Aalenian is a subdivision of the Middle Jurassic period of the geologic timescale that extends from about 175.6 million years BP to about 171.6 million years BP. It was preceded by the Toarcian era and succeeded by the Bajocian. The Middle Jurassic, called the Dogger in the European system of classification, is the second epoch of the Jurassic period. ... The geologic time scale is used by geologists and other scientists to describe the timing and relationships between events that have occurred during the history of the Earth. ... Before Present is a year numbering system, used for the far past times, relating dates to the year 1950. ... The Toarcian Stage was the last faunal stage of the Early Jurassic period. ... In the geologic timescale, the Bajocian is the age of the Middle Jurassic epoch of the Jurassic period of the Mesozoic era of the Fanerozoic eon that is comprehended between 171 million 600 thousand and 167 million 700 thousand years ago, approximatedly. ...

Jurassic period
Lower/Early Jurassic Middle Jurassic Upper/Late Jurassic
Hettangian Sinemurian Aalenian Bajocian Oxfordian Kimmeridgian
Pliensbachian Toarcian Bathonian Callovian Tithonian
Mesozoic era
Triassic Jurassic Cretaceous

Jump to: navigation, search 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. ... Lower Jurassic (also known as Lias) is the earliest of three epochs of Jurassic period. ... The Middle Jurassic, called the Dogger in the European system of classification, is the second epoch of the Jurassic period. ... Upper Jurassic (also known as Malm) was an epoch of the Jurassic geologic period. ... In the geologic timescale, the Bajocian is the age of the Middle Jurassic epoch of the Jurassic period of the Mesozoic era of the Fanerozoic eon that is comprehended between 171 million 600 thousand and 167 million 700 thousand years ago, approximatedly. ... The Toarcian Stage was the last faunal stage of the Early Jurassic period. ... Jump to: navigation, search In the geologic timescale, the Bathonian is the age of the Middle Jurassic epoch of the Jurassic period of the Mesozoic era of the Fanerozoic eon that is comprehended between 167 million 700 thousand and 164 million 700 thousand years ago, approximatedly. ... Jump to: navigation, search The Callovian is a stage on the geologic time scale occuring from 164. ... The Tithonian (141-135 MYA) is the most recent stage of the Jurassic era. ... The Mesozoic is one of three geologic eras of Phanerozoic eon. ... The Triassic is a geologic period that extends from about 245 to 202 million years ago (mya). ... Jump to: navigation, search 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. ... The Cretaceous period is one of the major divisions of the geologic timescale, reaching from the end of the Jurassic period (about 146 MYA) to the beginning of the Paleocene epoch of the Tertiary period (65. ...



Millions of Years

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Internet Resources Newsletter: Issue 87, December 2001 (5123 words)
The initiative to put Oxford’s reference texts online has already meant the digitization of tens of millions of words, and the complex and extensive restructuring and tagging of texts.
From ‘Aalenian’ in the Dictionary of Earth Sciences to ‘ZZ Ceti star’ in the Dictionary of Astronomy, material equivalent to over 60,000 book pages is being turned into more than more 500Mb of data.
This will be delivered using extensive innovations in functionality on a site created to be attractive and easy to use.
  More results at FactBites »

 
 

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