Homérien

Homérien
Notation chronostratigraphique s5
Notation RGF s2b
Stratotype 52° 36′ 56″ N, 2° 33′ 53″ O
Niveau Étage / Âge
Époque / Série
- Période / Système
-- Érathème / Ère 		Wenlock
Silurien
Paléozoïque

Stratigraphie

DébutFin
Point stratotypique mondial 430,5 ± 0,7 Ma Point stratotypique mondial 427,4 ± 0,5 Ma

Sheinwoodien Gorstien

modifier

L’Homérien est le cinquième étage du Silurien, dans l'ère paléozoïque. Cette subdivision est la plus récente de la série géologique du Wenlock et s'étend de 430.5 ± 0.7 à 427.4 ± 0.5 millions d'années. Elle est précédée par le Sheinwoodien et suivie par le Gorstien[1],[2].

Stratigraphie

Système Série Étage Âge (Ma)
Dévonien Inférieur Point stratotypique mondial Lochkovien plus récent
Silurien Pridoli Point stratotypique mondial 423.0 – 419.2
Ludlow Point stratotypique mondial Ludfordien 425.6 – 423.0
Point stratotypique mondial Gorstien 427.4 – 425.6
Wendock Point stratotypique mondial Homérien 430.5 – 427.4
Point stratotypique mondial Sheinwoodien 433.4 – 430.5
Llandovery Point stratotypique mondial Télychien 438.5 – 433.4
Point stratotypique mondial Aéronien 440.8 – 438.5
Point stratotypique mondial Rhuddanien 443.8 – 440.8
Ordovicien Supérieur Point stratotypique mondial Hirnantien plus ancien
Subdivisions du Silurien d'après l'ICS, août 2018.

Le point stratotypique mondial (PSM) de l'Homérien est situé le long d'un petit cours d'eau, affluent du ruisseau Sheinton (Sheinton Brook) à 500 m au nord du hameau Homer — le nom de l'étage faisant référence à ce lieu —, dans le comté de Shropshire en Grande-Bretagne (52° 36′ 56″ N, 2° 33′ 53″ O). Le PSM se trouve dans la partie supérieure du Membre Apedale de la Formation Coalbrookdale. La base de l'étage correspond au niveau d'apparition du graptolite Cyrtograptus lundgreni[3],[4].

Notes et références

  1. ↑ (en) « International chronostratigraphic chart (2012) » [PDF], sur stratigraphy.org.
  2. ↑ (en) F.M. Gradstein, J.G Ogg, M. Schmitz et G. Ogg, The Geologic Time Scale 2012, Elsevier, , 1176 p. (ISBN 978-0-444-59448-8, lire en ligne).
  3. ↑ (en) « GSSP Table - Paleozoic Era », sur Geologic TimeScale Foundation (consulté le ).
  4. ↑ (en) Charles H. Holland, « The State of Silurian Stratigraphy », Episodes, vol. 5, no 3,‎ , p. 21-23 (lire en ligne [PDF]).

Voir aussi

Articles connexes

Liens externes

v · m
Cambrien
Ordovicien
Silurien
Dévonien
Carbonifère
Permien
Échelle des temps géologiques

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