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弗朗斯维尔前寒武纪盆地的沉积岩系由两个连续的砂-泥质的旋回构成。厚度为1000至1500米,岩系充填于规则沉陷的前缘坳陷盆地。铀矿化赋存于基底砂岩的上部。铀源来自富矿岩石的淋滤(基底或火山岩层)及在沉积构造
Sedimentary rocks in the Precambrian basin of Francesville consist of two successive sand-muddy cycles. Thicknesses range from 1,000 to 1,500 meters and fill in the regularly subsided frontal depression basin. Uranium mineralization occurs in the upper part of the basement sandstone. Uranium originates from leaching (basal or volcanic strata) of rich rock and in sedimentary formations