Aalenian

Aalenian

The Aalenian (pronEng|ɑːˈliːniən) is a subdivision of the Middle Jurassic epoch 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.

The stage takes its name from the town of Aalen, some 100 km east of Stuttgart in Germany. The town lies at the southwestern end of the Frankischer Jura.

Invertebrate Fauna

Ammonitids

References


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  • aalenian — AALENIÁN, Ă, aalenieni, e, s.n., adj. 1. s.n. Primul etaj al jurasicului mediu sau ultimul etaj al jurasicului inferior. 2. adj. Care aparţine aalenianului (1), privitor la aalenian. [pr.: a a le ni an] – Din fr. aalénien. Trimis de cata,… …   Dicționar Român

  • Aalenian — 1. noun A subdivision of the Middle Jurassic period. 2. adjective Of or pertaining to the Aalenian period …   Wiktionary

  • Aalenian Stage — ▪ geology       lowest of the four divisions of the Middle Jurassic Series, representing all rocks formed worldwide during the Aalenian Age, which occurred between 175.6 million and 171.6 million years ago during the Jurassic Period. The Aalenian …   Universalium

  • aalenian — The oldest stage of the Middle Jurassic …   Dictionary of automotive terms

  • Aalenian — …   Useful english dictionary

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  • Geologic time scale — This clock representation shows some of the major units of geological time and definitive events of Earth history. The Hadean eon represents the time before fossil record of life on Earth; its upper boundary is now regarded as 4.0 Ga.[1] Other… …   Wikipedia

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