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Aalenian

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The Aalenian Template:IPAc-en is a subdivision of the Middle Jurassic epoch/series 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 and succeeded by the Bajocian.[1]

Stratigraphic definitionsEdit

The Aalenian takes its name from the town of Aalen, some 70 km east of Stuttgart in Germany. The town lies at the southwestern end of the Frankischer Jura. The name Aalenian was introduced in scientific literature by Swiss geologist Karl Mayer-Eymar in 1864.

The base of the Aalenian is defined as the place in the stratigraphic column where the ammonite genus Leioceras first appears. A global reference profile is located 500 meters north from the village of Fuentelsaz in the Spanish province of Guadalajara.[2] The top of the Aalenian (the base of the Bajocian) is at the first appearance of ammonite genus Hyperlioceras.

In the Tethys domain, the Aalenian contains four ammonite biozones:

PalaeontologyEdit

†AmmonitidsEdit

Ammonitids of the Aalenian
Taxa Presence Location Description Images
  • Abbasites platystomus
Confirmed.[3] The only known species in this Alaskan genus. Abbasites is believed to be ancestral to the ammonite family Otoitidae.
Confirmed.[3]
Confirmed.[3]
Confirmed.[3]
  • Brasilia
Confirmed.[3]
Confirmed.[3]
Confirmed.[3]
Confirmed.[3]
Confirmed.[3]
Confirmed.[3]
Confirmed.[3]
Confirmed.[3]
Confirmed.[3]
Confirmed.[3]
Confirmed.[3]
Confirmed.[3]
Confirmed.[3]
  • Ludwigia
Confirmed.[3] Synonymous with a modern plant genus.
Confirmed.[3]
Confirmed.[3]
Confirmed.[3]
Confirmed.[3]
Confirmed.[3]
Confirmed.[3]
Confirmed.[3]
Confirmed.[3]
Confirmed.[3]
Confirmed.[3]
Confirmed.[3]
Confirmed.[3]
Confirmed.[3]
Confirmed.[3]

†BelemnitesEdit

Belemnites of the Aalenian
Taxa Presence Location Description Images
Confirmed.[3]
Confirmed.[3]
Confirmed.[3]
  • Megateuthis
Confirmed.[3] This Eurasian species was the largest known Belemnite and could grow to lengths of up to 10 feet.
Confirmed.[3]
Confirmed.[3]
Confirmed.[3]

†ThalattosuchiansEdit

Thalattosuchia of the Aalenian
Taxa Presence Location Description Images
Switzerland; Morocco; England; France; Germany

References Edit

NotesEdit

Template:Reflist

LiteratureEdit

External linksEdit

Template:Jurassic Footer Template:Geological history


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