{"refrec":{"BRefID":223783,"RR":"<b>Vanguestaine, M.; Van Looy, J.</b> (1983). Acritarches du Cambrien moyen de la vallée de Tacheddirt (Haut-Atlas, Maroc) dans le cadre d'une nouvelle zonation du Cambrien. <i>Ann. Soc. géol. Belg. (1968) 106(1)</i>: 69-85","BEntID":215506,"PublicFlag":1,"CheckedFlag":0,"wosflag":null,"vabbflag":null,"RefStringPartII":". <i>Ann. Soc. Géol. Belg. (1968) 106(1)</i>: 69-85","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Vanguestaine, M.; Van Looy, J.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Vanguestaine, M.; Van Looy, J.","Englishabstract":"The limestones and siltstones which crop out in the Tacheddirt Valley of the High Atlas Mountains (Morocco), have provided 13 acritarch localities yielding 16 species, including two new ones, viz. <i>Multiplicisphaeridium chakor</i> and <i>Timofeevia tacheddirtensis</i>. Two different associations have been distinguished. The older one is the most diversified and is characterised by the constant presence of <i>Cristallinium cambriense</i> (Slavikova) Vanguestaine, 1978, <i>Eliasum llaniscum</i> Fombella, 1978 and <i>Timofeevia lancarae</i> (Cramer & Diez) Vanguestaine, 1978. The younger one is only composed of sphaeromorphs and <i>Micrhystridium</i>. Trilobite remains reported in the present paper date the older association as the <i>Paradoxides oelandicus</i> \"stage\" or early <i>Paradoxides paradoxissimus</i> \"stage\" of the Middle Cambrian. The younger assemblage is also associated locally with Middle Cambrian trilobites.A biostratigraphic zonation for the entire Cambrian shows that 7 acritarch Zones or Superzones may be distinguished. This zonation allows the rocks at Tacheddirt to be assigned biostratigraphically. The chronostratigraphic implications are dealt with in the conclusions.","AbstractOtherLang":"Les calcaires et \"siltstones\" qui affleurent dans la vallée de Tacheddirt (Haut-Atlas, Maroc) ont fourni 13 gîtes à Acritarches parmi lesquels sont identifiées 16 espèces dont 2 sont nouvelles : <i>Multiplicisphaeridium chakor</i> et <i>Timofeevia tacheddirtensis</i>. L'hétérogénéité de distribution stratigraphique des espèces indique l'existence de deux associations. La plus ancienne est diversifiée et se caractérise par la présence constante de <i>Cristallinium cambriense</i> (Slavikova) Vanguestaine, 1978, <i>Eliasum llaniscum</i> Fombella, 1978 et <i>Timofeevia lancarae</i> (Cramer & Diez) Vanguestaine, 1978. La plus récente est peu diversifiée, composée seulement de Sphaeromorphes et de <i>Micrhystridium</i>. La première est localement datée par Trilobites dont la découverte est rapportée ici pour la première fois. Elle appartient, en partie du moins, soit à l'\"étage\" à <i>Paradoxides oelandicus</i> soit à la partie inférieure de l'\"étage\" à <i>Paradoxides paradoxissimus</i> du Cambrien Moyen. La seconde est localement datée aussi par Trilobites qui indiquent le Cambrien Moyen.Un schéma biostratigraphique, en 7 Zones et Superzones d'Acritarches, synthétise, pour la première fois, les données, disponibles pour l'ensemble du Cambrien. Il permet de situer correctement, dans leur contexte biostratigraphique les unités lithologiques analysées à Tacheddirt. Les implications des précisions chronostratigraphiques découlant de ce travail sont consignées dans les conclusions.","BibLvlCode":"AS","StandardTitle":"Acritarches du Cambrien moyen de la vallée de Tacheddirt (Haut-Atlas, Maroc) dans le cadre d'une nouvelle zonation du Cambrien","OrigTitleLangCode":"fr","OrigTitleLangCodeExtended":"fre","OrigTitleLangID":22,"DateLastModified":{"date":"2026-06-08 01:30:57.126420","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":1983,"MonPub":null,"DateUpdate":"2014-10-16","DateCreate":"2013-03-21","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":1},"refs":null,"anarec":{"AnaID":223783,"PubliDate":1983,"Pagination":"69-85","XtraPublOfAnaID":null,"ISBN":null,"Volume":"106","Issue":"1","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":45503,"SerRR":"Annales de la Société géologique de Belgique. 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