File:Keystone vugs meniscus.jpg

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Français : Sommet de séquence émersive, Lias moyen, Moyen Atlas, Maroc. Lame mince.Diagenèse aérienne, supratidale (vadose) dans un sable carbonaté à foraminifères déplacés par les courants de marée et les vagues de tempêtes sur le platier. "Keystone vugs" et ciment ménisque ("point contact cement") indiquant une diagenèse précoce. Un équivalent actuel a été observé par Davaud & Septfontaine (1995) dans les dépôts côtiers du sud du golfe de Gabès, Tunisie
English: Thin section from the top of an emersive sequence, middle liassic, middle Atlas of Morocco. Aerial and supratidal (vadose) diagenesis in a carbonate sand rich in foraminifera displaced on the flat by tidal currents and tempestites. Early diagenesis with meniscus (point contact) cement. Recent equivalent in Davaud Septfontaine (1995), coastal deposits of Tunisia.
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Author Septfontaine

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current12:42, 10 October 2011Thumbnail for version as of 12:42, 10 October 20112,464 × 1,646 (3.32 MB)Septfontaine (talk | contribs)

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