Global InformationAzilal Formation information
| Azilal Formation | |
|---|---|
| Stratigraphic range: Toarcian-Middle Aalenian Polymorphum-Murchisonae | |
 Panoramic of the High Atlas on Gorges du Dadés with Toarco-Aalenian Redbeds | |
| Type | Geological formation |
| Unit of | Tafraout Group |
| Underlies |
|
| Overlies |
|
| Area | High Atlas[1][2] |
| Thickness | 300-800 m[3] |
| Lithology | |
| Primary | Argillite, conglomerate (+quartz-dredge conglomerates) |
| Other | Brown-red marl, siltstones (micro-sandstones), sandstone-pelitic, breccias with liasic limestone elements, lagoonal shale, sandstone and volcanic minerals.[3] |
| Location | |
| Location | Azilal Province |
| Coordinates | 31°18′N 6°36′W / 31.3°N 6.6°W |
| Approximate paleocoordinates | 26°36′N 3°24′W / 26.6°N 3.4°W |
| Region | High Atlas[4][5] |
| Country |  Morocco |
| Type section | |
| Named for | Azilal |
| Named by |
|
| Location | Northwest side of Jbel Mesgounane, 10 kilometers east of Azilal |
| Year defined |
|
| Thickness at type section | ~250 m (820 ft) |
  Azilal Formation (Morocco) | |
The Azilal Formation, also known as Toundoute Continental Series and Wazzant Formation (Called Informally "Marnes chocolat"), is a geological unit in the Azilal, Béni-Mellal, Imilchil, Zaouiat Ahansal, Ouarzazate, Tinerhir and Errachidia areas of the High Atlas of Morocco, that cover the Early Toarcian to Middle Aalenian stages of the Jurassic Period.[8] While there have been atributions of it´s lowermost layers to the Latest Pliensbachian, the current oldest properly measured are part of the Earliest Toarcian regresion ("MRST10"), part of the Lower-Middle Palymorphum biozone.[8] The Azilal Formation consists mainly of claystones rich in continental plant debris and laminated microbial facies.[9] It is a continental deposit which overlies marine dolomites of equivalent age to the Rotzo Formation of Italy, mostly part of the Aganane Formation.[6] The formation is the continental part of a massive Siliciclastic-Carbonate platform ("Tafraout Platform"), best assigned to an alluvial environment occasionally interrupted by shallow marine incursions (tidal flat setting) and marks a dramatic decrease of the carbonate productivity under increasing terrigenous sedimentation.[10] Dinosaur remains, such the sauropod Tazoudasaurus and the basal ceratosaur Berberosaurus are known from the unit, along with several undescribed genera.[11] The toarcian High Atlas is divided in 5 units: the continental layers with paralic deposits belong to the Azilal, along the shoreface layers of the Tagoudite Formation and Tafraout Formation & Aguerd n’Tazoult Formation, connected with the offshore Ait Athmane Formation and the deeper shelf deposits of the Agoudim 1 Formation.[12]
- ^ a b Jenny, J. (1985). "Carte Géologique du Maroc au 1: 100.000, feuille Azilal". Notes et Mémoires du Service Géologique du Maroc. 339 (2): 1–104. Retrieved 25 January 2022.
- ^ Jenny, J. (1988). "Carte géologique du Maroc au 1/100 000: feuille Azilal (Haut Atlas central). Mémoire explicatif". Notes et Mémoires du Service géologique. 378 (1): 1–122. Retrieved 25 January 2022.
- ^ a b c Le Marrec, A.; Jenny, J. (1980). "L'accident de Demnat, comportement synsedimentaire et tectonique d'un decrochement transversal du Haut-Atlas central (Maroc)". Bulletin de la Société Géologique de France. 7 (3): 421–427. Retrieved 25 January 2022.
- ^ Peleogeographiques, C. E. R. (2002). "Les formations lithostratigraphiques jurassiques du Haut Atlas central (Maroc) : corrélations et reconstitutions paléogéographiques". Documents des laboratoires de géologie Lyon. 156 (1): 163. Retrieved 25 January 2022.
- ^ El Bchari, F.; Ibouh, H.; Souhel, A.; Taj-Eddine, K.; Canérot, J.; Bouabdelli, M. (2001). "Cadre stratigraphique et étapes de structuration de la plate-forme liasique d'Aït Bou Guemmez (Haut-Atlas central, Maroc)". Revista de Geociências. 16 (3): 163–172. Retrieved 25 January 2022.
- ^ a b Souhel, A.; El Hariri, K.; Chafiki, D.; Canerot, J. (1998). "Stratigraphie sequentielle et evolution geodnamique du Lias (Sinemurien terminal-Toarcien moyen) de l'Atlas de Beni-Mellal (Haut Atlas central, Maroc)". Bulletin de la Société Géologique de France. 169 (4): 527–536. Retrieved 25 January 2022.
- ^ Jossen, J. A. (1990). "Carte géologique du Maroc au 1/100000, feuille de Zawyat Ahançal". Notes et Mém. Serv. Géol. Maroc. 1 (1): 355. Retrieved 25 April 2022.
- ^ a b Krencker, F.-N.; Fantasia, A.; El Ouali, M.; Kabiri, L.; Bodin, S. (2022). "The effects of strong sediment-supply variability on the sequence stratigraphic architecture: Insights from early Toarcian carbonate factory collapses". Marine and Petroleum Geology. 136: 105469. doi:10.1016/j.marpetgeo.2021.105469. ISSN 0264-8172.
- ^ Cite error: The named reference
Krenckerwas invoked but never defined (see the help page). - ^ Ettaki, M; Ouahhabi, B.; Dommergues, J. L.; Meister, C.; Chellaï, E. H. (2011). "Analyses biostratigraphiques dans le Lias de la bordure sud de la Téthys méditerranéenne: l'exemple de la frange méridionale du Haut-Atlas central (Maroc)". Bulletin de la Société Géologique de France. 182 (6): 521–532. doi:10.2113/gssgfbull.182.6.521. Retrieved 25 January 2022.
- ^ Haddoumi, H.; Charrière, A.; Mojon, P. O. (2010). "Stratigraphie et sédimentologie des "Couches rouges" continentales du Jurassique-Crétacé du Haut Atlas central (Maroc): implications paléogéographiques et géodynamiques". Geobios. 43 (4): 433–451. Bibcode:2010Geobi..43..433H. doi:10.1016/j.geobios.2010.01.001.
- ^ Stüder, M.; du Dresnay, R. (1980). "Deformations synsedimentaires en compression pendant le Lias superieur et le Dogger, au Tizi n'Irhil (Haut Atlas central de Midelt, Maroc)". Bull. Soc. Géol. Fr. 34 (3): 391–397. doi:10.2113/gssgfbull.S7-XXII.3.391. Retrieved 28 March 2022.