File:Tunisie teepee.jpg
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Français : Structures diagénétiques en "teepee" sur le fond d'une lagune actuelle asséchée ("chott"), dues à la cristallisation du sel. Tunisie, région de Zarzis (voir Davaud, Strasser & M'Rabet, 1991, livret guide). De telles figures sont fréquentes au sommet des séquences émersives autocycliques du Lias moyen du Haut Atlas (- 190 millions d'années, Septfontaine, 1985) et provoquent parfois le décollement des niveaux de tapis algaires ("algal mats"). Dans le fossile, les "teepee" sont toujours dolomitisés, de couleur jaune. English: "Teepee" diagenetic structures in a muddy sediment of a coastal dried lagoon, due to salt cristallisation; Tunisia, Zarzis area, see Davaud, Strasser & M'Rabet (1991, field book). Such figures are frequent on top of regressive, autocyclic "shallowing upward" sequences from the Middle Liassic of Morocco (Septfontaine, 1985). Fossil "teepee" are dolomitized, yellow, and algal laminations disrupted by crystallisation pressure. |
| Date | |
| Source | Own work |
| Author | Septfontaine |
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| current | 15:12, 15 March 2012 | | 796 × 609 (119 KB) | Septfontaine (talk | contribs) |
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