![]() mureroensis avec les strates qui sont sus-jacentes à la base du Cambrien moyen marocain, et que les trilobites paradoxides, servant de guide pour le Cambrien moyen, apparaissent au Maroc à un niveau inférieur. On démontre une corrélation de la Zone à A. ![]() La définition conventionnelle de la base du Cambrien moyen en Espagne (base de la Zone à Acadoparadoxides mureroensis) a soulevé des problèmes, même en tentant les mises en corrélation dans d'autres régions du Gondwana occidental (i.e., le Maroc), à cause d'une erreur d'identification répétée des espèces Paradoxides ( Acadoparadoxides) mureroensis et des protolénides dans les strates immédiatement sous-jacentes. Les corrélations raffinées, des strates de la limite du Cambrien inférieur-moyen et des strates du Cambrien moyen, entre les paléocontinents cambriens requièrent une connaissance approfondie des variations stratigraphiques locales alliées à des genres et espèces de trilobites bien définis. atlasensis and the new species S.? ornatus and P. Sdzuy, which were largely based on generalized taxonomic assignments of G. The occurrences of the majority of the new Moroccan taxa clearly corroborate earlier interregional and intercontinental correlations by the author and refine and modify proposals by K. (type species Calymene holometopa Angelin 1851) is based on a well-known species from the Middle Cambrian of Baltica. Gigoutella atlasensis Hupé 1953 is described in detail for the first time. and n.sp., and Cambrophatictor cataractis n.gen. They are Condylopyge eli n.sp., Schistocephalus? ornatus n.sp., Paradoxides ( Acadoparadoxides) nobilis n.sp., Parasolenopleura lemdadensis n.sp., Bailiella inconspicua n.sp., Bailiella dilatata n.sp., Atopiaspis tikasraynensis n.gen. Two new genera and eight new species of Middle Cambrian trilobites from the Moroccan High Atlas and Anti-Atlas are proposed. These correlations are strengthened by a reevaluation of higher Middle Cambrian trilobite genera and species in Morocco and their use in correlation into Spain and Baltica. mureroensis Zone is shown to correlate into strata above the base of the Moroccan Middle Cambrian, and paradoxidid trilobites, a guide to the Middle Cambrian, have a lower occurrence in Morocco. The conventional definition of the base of the Middle Cambrian in Spain (base of Acadoparadoxides mureroensis Zone) has led to problems even when correlations into other West Gondwanan regions (i.e., Moroccan) are attempted because Paradoxides ( Acadoparadoxides) mureroensis and protolenid species from immediately underlying strata have been regularly misidentified. Refined correlations of Lower-Middle Cambrian boundary strata and Middle Cambrian strata between Cambrian paleocontinents require an improved understanding of local stratigraphic ranges of well-defined trilobite genera and species.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |