The Voirons Flysch (Caron in Eclogae Geologicae Helvetiae 69:297–308, 1976), is a flysch sequence aggregated into the sedimentary accretionary prism of the Chablais and Swiss Prealps. Its palaeogeographic location is still debated (South Piemont or Valais realm). We herein present a stratigraphic revision of the westernmost unit of the former Gurnigel Nappe sensu Caron (Eclogae Geologicae Helvetiae 69:297–308, 1976): the Voirons Flysch. This flysch is subdivided into three lithostratigraphic units at the formation level (the Voirons Sandstone, the Vouan Conglomerate, the Boëge Marl), with an additional unit (Bruant Sandstone) of uncertain attribution, ranging from the early Eocene to probably the late Eocene. We further propose a new model of the depositional setting of the deep-sea of the Voirons Flysch based on palaeocurrent directions, the overall geometry and sedimentary features. This model depicts an eastward deflected deep-sea fan. The stratigraphic record of the proximal part of this fan is fairly complete in the Voirons area, whereas its most distal part is only represented by one small exposure of thinly bedded sandstones in the Fenalet quarry. The stratigraphic evolution of the Voirons Flysch shows two major disruptions of the detrital sedimentation at the transition between Voirons Sandstone—Vouan Conglomerate and Vouan Conglomerate—Boëge Marl. The cause of these disturbances has to be constrained in the framework of the palaeogeographic location of the Voirons Flysch.

中文翻译：

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Voirons Flysch（Voirons Nappe，Chablais Prealps）的深海扇形地层改建和重建

Voirons Flysch（Caron in Eclogae Geologicae Helvetiae 69：297-308，1976）是一种复理序列，聚集在Chablais和Swiss Prealps的沉积增生棱镜中。其古地理位置仍在争论中（南皮埃蒙特或瓦莱州）。我们在此介绍了前古尼格尔·纳普·森苏·卡隆（Eurlogae Geologicae Helvetiae 69：297–308，1976）的最西面单元的地层学修订：Voirons Flysch。复层岩层在地层被细分为三个岩石地层单元（沃隆岩砂岩，沃昂砾岩岩层，勃艮第马尔），以及一个附加单元（布鲁安砂岩），其归因不确定，范围从始新世早期到始新世晚期。我们进一步提出了基于古洋流方向的Voirons Flysch深海沉积环境的新模型，总体几何形状和沉积特征。该模型描绘了一个向东偏转的深海风扇。在Voirons地区，该扇近端部分的地层记录相当完整，而在Fenalet采石场中，其最远端部分仅由少量层状砂岩的少量暴露所代表。Voirons Flysch的地层演化表明，在Voirons砂岩（Vouan砾岩和Vouan砾岩-BoëgeMarl）之间的过渡处，碎屑沉积有两个主要破坏。这些干扰的原因必须限制在Voirons Flysch的古地理位置框架内。而在Fenalet采石场中，其最远端部分仅由少量层状砂岩的少量暴露所代表。Voirons Flysch的地层演化表明，在Voirons砂岩（Vouan砾岩和Vouan砾岩-BoëgeMarl）之间的过渡处，碎屑沉积有两个主要破坏。这些干扰的原因必须限制在Voirons Flysch的古地理位置框架内。而在Fenalet采石场中，其最远端部分仅由少量层状砂岩的少量暴露所代表。Voirons Flysch的地层演化表明，在Voirons砂岩（Vouan砾岩和Vouan砾岩-BoëgeMarl）之间的过渡处，碎屑沉积有两个主要破坏。这些干扰的原因必须限制在Voirons Flysch的古地理位置框架内。