File:Tunisie carottes Zarzis.jpg
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[edit]DescriptionTunisie carottes Zarzis.jpg |
Français : Carottes prélevées manuellement dans une ancienne lagune ou "chott" en Tunisie dans le cadre d'un cours de 3e cycle organisé par l'Uni de Genève (Davaud & Strasser, 1991) et l'Uni de Tunis (M'Rabet 1991). On observe deux séquences émersives "shallowing upward" quaternaires tout a fait comparables aux séquences sédimentaires autocycliques décrites par Septfontaine (1985) dans le Lias moyen (- 190 millions d'années) du Haut Atlas marocain. voir: plate-forme (Géologie) - Cycle sédimentaire - English: Cores from a quaternary lagoonal "chott" in Tunisia, showing two typical "shallowing upward" sequences, from marine (in blue) to intertidal - supratidal (yellow) environments with algal mats. Black soil at the top. See Davaud, Strasser & M'Rabet (field book,1991), Identical sequences were described by Septfontaine (1985) in the middle Liassic of Morocco, in an autocyclic context. Abundant displaced foraminifera (orbitopsellids), by hurricanes and tidal currents, were also observed on top of sequences, as in the recent tunisian analogue. |
Date | |
Source | Own work |
Author | Septfontaine |
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current | 08:39, 16 March 2012 | 666 × 2,468 (316 KB) | Septfontaine (talk | contribs) |
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Camera model | CyberView CS - ImageBoxIR |
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File change date and time | 17:13, 16 January 2012 |
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