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Les Marnes à Foraminifères et les Schistes à <i>Meletta</i> des chaînes subalpines septentrionales (Haute-Savoie, France)

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Les Marnes à Foraminifères et les Schistes à Meletta des chaînes subalpines septentrionales (Haute-Savoie, France)

CHAROLLAIS, Jean-Jacques, et al.

Abstract

Un inventaire micropaléontologique détaillé des formations calcaréo-argileuses du massif des Bornes permet d'attribuer avec certitude à l'Oligocène inférieur la plus grande partie des Marnes à Foraminifères et la totalité des Schistes à Meletta. Encore que cette datation repose surtout sur des échelles de zonation basées sur les palynomorphes et les Foraminifères planctoniques, on retrouve ici tout à fait clairement les associations décrites de l'Oligocène inférieur de régions non tropicales. Les Foraminifères benthiques, le nannoplancton et les Ostracodes s'accordent bien avec une telle attribution; ces derniers situent le dépôt des Marnes à Foraminifères dans le domaine épibathyal; l'appauvrissement de la microfaune, ainsi que le phytoplancton des Schistes à Meletta indiquent, par contre, que l'évolution du milieu de dépôt s'est effectuée dans le sens d'un certain confinement.

CHAROLLAIS, Jean-Jacques, et al. Les Marnes à Foraminifères et les Schistes à Meletta des chaînes subalpines septentrionales (Haute-Savoie, France). Eclogae Geologicae Helvetiae, 1980, vol. 73, no. 1, p. 9-69

DOI : 10.5169/seals-164943

Available at:

http://archive-ouverte.unige.ch/unige:138309

Disclaimer: layout of this document may differ from the published version.

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