However, the bulk of material comes from a finely granulated siltstone lense at the very border between the 'grey' and 'red' members. This level appears to represent a transsection through the ancient water-body. Stratigraphic discontinuity is detected around the insectiferous lense. To the left, the siltstone gradually transforms into palaeosols; whereas to the right, this discontinuity disappears, and sediments represent a deeper part of the reservoir.
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