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Titonium

Periode/
sisteem
Epog/
serie
Tydsnede/
etage
M. jaar
gelede
Kryt Vroeg Berriasium jonger
Jura Laat Titonium 145,0–152,1
Kimmeridgium 152,1–157,3
Oxfordium 157,3–163,5
Middel Callovium 163,5–166,1
Batonium 166,1–168,3
Bajosium 168,3–170,3
Aalenium 170,3–174,1
Vroeg Toarsium 174,1–182,7
Pliensbachium 182,7–190,8
Sinemurium 190,8–199,3
Hettangium 199,3–201,3
Trias Laat Rhaetium ouer
Die verdeling van die Jura (IKS).

Die Titonium is die laaste chronostratigrafiese etage sowel as geologiese tydsnede van onderskeidelik die sisteem en periode Jura (serie/epog Laat Jura). Dit verwys dus na ’n tydperk sowel as die gesteentes wat in dié tydperk gevorm het.

Die tydperk was van sowat 152,1 tot 145 miljoen jaar gelede.[1] Dit is voorafgegaan deur die Kimmeridgium en gevolg deur die eerste etage/tydsnede van die Kryt, die Berriasium.

Naam en definisie

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Die naam Titonium is deur die Duitse paleontoloog Albert Oppel genoem na Titon, wat in die Griekse mitologie die seun was van koning Laomedon van Troje. Titon het verlief geraak op Eos, die Griekse godin van die daeraad. Omdat die Titonium die laaste Jurassiese periode is, is dit die "daeraad" van die Kryt.

Die basis van die etage word gedefinieer deur die eerste voorkoms van die ammoniet Hybonoticeras hybonotum, van Gravesia genus en die begin van die magnetiese chronosone M22An. Die bokant word gedefinieer deur die eerste voorkoms van die ammoniet Berriasella jacobi

Verwysings

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  1. Gradstein et al. (2012)

Bronne

[wysig | wysig bron]
  • (en) Gradstein, F.M.; Ogg, J.G.; Schmitz, M.D. & Ogg, G.M.; 2012: A Geologic Time Scale 2012, Elsevier, ISBN 0444594256.
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Titonium
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