The Tagoudite Formation (also known as the "Upper Tamadout Formation") is a geological formation of Toarcian (Lower Jurassic ) age in the Béni-Mellal , Imilchil , Tinerhir , Tinejdad and Errachidia areas of the High Atlas (reaching areas near Rich in the Middle Atlas[ 1] Morocco .[ 2] [ 3]
Description Profile at Ouguerd Zegzaoune with the Tagoudite and Tafraout Fms The Tagoudite Formation marks a major shift in Liassic sedimentation, replacing the carbonate turbidites of the Ouchbis Formation with mostly siliciclastic layers. These layers alternate between gray and green sandstone, sandy marls, and siltstones, forming sequences up to 20 meters thick.[ 4] [ 4] [ 5] Cirque de Jaafar , SW of Midelt or more at the E at Bou Redine Gorges, were the Agoudim 1 Formation directly overlies the Pliensbachian.[ 6]
Biota Phytoplankton marks oscillations of negative carbon isotope excursions at T-OAE and Pliensbachian-Toarcian (Pl-To) transition, dominated by open marine haptophytan or incertade sedis coccoliths like Biscutum, Carinolithus (including the index C. superbus , marker of the Polymorphum biozone), Calcivascularis , Calyculus, Lotharingius, Mitrolithus, Parhabdolithus or Schizosphaerella, measured in the Tagoudite Fm in areas like Amellago or Talghemt.[ 7] [ 8] [ 9] Dinoflagellates are rare and limited to taxa such as Luehndea, Mancodinium and Mendicodinium.[ 10]
Color key Notes small text ; crossed out taxa are discredited.
Foraminifera Genus Species Location Material Notes Images Dentalina [ 11] Tests/shells A foraminifer of the family Nodosariinae. Citharina [ 12] Tests/shells A foraminifer of the family Vaginulininae. Everticyclammina [ 11] [ 13] Aguerd N´Igli Aguerd N´Wahmane Col de Ghnim Ouguerd Zegzaoune Tizi n-M´Barek Tests/shells A foraminifer of the Everticyclamminidae family. Ichtyolaria [ 11] [ 14] Tests/shells A foraminifer of the family Ichthyolariinae. Lenticulina [ 15] [ 14] [ 16] L. matutina L. gottingensis L. acutiangulata L. münsteri L. toarcense L. chichery L. sp. Anergui Bou-Oumardoul Taquat N'Agrd Talghemt Tests/shells A foraminifer of the family Lenticulininae. Lingulina [ 15] L. brizaeformis L. pupa L. dentaliformis L. tenera Bou-Oumardoul Taquat N'Agrd Tests/shells A foraminifer of the family Lenticulininae. Marginulina [ 15] Tests/shells A foraminifer of the family Marginulininae. Ophtalmidium[ 13] [ 15] [ 17] [ 16] Aguerd N´Igli Anergui Bou-Oumardoul Ilourhmane Jebel Toksine Ouguerd Zegzaoune Taquat N'Agrd Timghissine Tests/shells A foraminifer of the family Ophthalmidiidae. Orbitopsella [ 18] Tests/shells A foraminifer of the family Orbitopsellinae. Pseudocyclammina [ 11] [ 13] Aguerd N´Igli Bou-Oumardoul Tests/shells A foraminifer of the family Hauraniidae. Pseudonodosaria [ 15] [ 14] P. tennis P. multicostata P. gr.pygmea P. sp. Bou-Oumardoul Ilourhmane Ouguerd Zegzaoune Talghemt Taquat N'Agrd Tests/shells A foraminifer of the family Nodosariinae. Reinholdella [ 11] [ 13] [ 16] Tests/shells A foraminifer of the family Ceratobuliminidae. Verneuilinoides [ 14] Tests/shells A foraminifer of the family Verneuilinoidinae
Ichnofossils
Brachiopoda Genus Species Location Material Notes Images Quadratirhynchia [ 22] Akka n’Igoulzane Jebel Bou Ifliyou Jebel Ich Taskouine Shells A brachiopod of the family Tetrarhynchiidae Homoeorhynchia [ 23] [ 22] H. meridionalis H. batalleri Akka n’Igoulzane Jebel Bou Ifliyou Jebel Ich Taskouine Oued Mijdider Shells A brachiopod of the family Rhynchonellinae. Pseudogibbirhynchia [ 22] Shells A brachiopod of the family Pamirorhynchiinae Soaresirhynchia [ 22] S. tamazirta S. bouchardi Shells A brachiopod of the family Basiliolinae Telothyris [ 23] [ 22] Akka n’Igoulzane Jebel Bou Ifliyou Jebel Ich Taskouine Shells A brachiopod of the family Lobothyrididae.
Mollusks
Arthropoda Genus Species Location Material Notes Images Bairdia [ 36] Shells A marine ostracod of the family Bairdiinae. Bairdiacypris [ 36] Shells A marine ostracod of the family Bairdiinae. Kinkelinella [ 36] Shells A marine ostracod of the family Protocytheridae . Local dominant Lower Toarcian taxon Ogmoconcha [ 36] Shells A marine ostracod of the family Healdiidae. Polycope [ 37] Shells A marine ostracod of the family Polycopidae .
Echinodermata Rare Ophiuroid impressions can be observed.[ 38]
Genus Species Location Material Notes Images Apiocrinites [ 39] Columnar ossicles A crinoid of the family Apiocrinitidae Cotylederma[ 39] Columnar ossicles A crinoid of the family Cotyledermatidae Diplechinus[ 39] Ambulacrum, spines An echinoid of the family Stomechinidae Diplocidaris [ 39] Ambulacrum, spines An echinoid of the family Diplocidaridae Dubarechinus[ 39] Ambulacrum, spines An echinoid of the family Orthopsidae Firmacidaris[ 39] Ambulacrum, spines An echinoid of the family Cidaridae Hemicidaris [ 39] H. (Dorycidaris) termieri Ambulacrum, spines An echinoid of the family Hemicidaridae Pentacrinites [ 39] Columnar ossicles A crinoid of the family Pentacrinitidae Reconstruction of a few specimens Polypedina[ 39] Ambulacrum, spines An echinoid of the family Pedinidae
Actinopteri Several scales and teeth of fishes are know from several locations, coming from freshwater/lagoonal layers.[ 40]
Genus Species Location Material Notes Images Leptolepis [ 41] [ 42] Semiarticulated specimens Marine bony fish of the family Leptolepidae . L. coryphaenoides specime
Viridiplantae Phytoclasts , spores, pollen and Tasmanites & Botryococcus algae indicate that the palaeoenvironment of the lower Toarcian Amellago area was likely proximal continental shelf with a high terrestrial input, and notorious influence of brackish water in the depositional environment.[ 43] Classopollis [ 43]
See also Toarcian turnover Toarcian formations Tafraout Formation , SISTER UNIT, MoroccoAzilal Formation , SISTER UNIT, MoroccoAganane Formation , MoroccoCalcaires du Bou Dahar , MoroccoMarne di Monte Serrone , ItalyPodpeč Limestone , SloveniaEl Pedregal Formation , SpainMizur Formation , North CaucasusSachrang Formation , AustriaPosidonia Shale , Lagerstätte in GermanyIrlbach Sandstone , GermanyCiechocinek Formation , Germany and PolandKrempachy Marl Formation , Poland and SlovakiaDjupadal Formation , Central SkaneLava Formation , LithuaniaWhitby Mudstone , EnglandFernie Formation , Alberta and British Columbia Whiteaves Formation , British ColumbiaNavajo Sandstone , UtahLos Molles Formation , ArgentinaMawson Formation , AntarcticaKandreho Formation , MadagascarKota Formation , IndiaCattamarra Coal Measures , Australia
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