After the "establishement of floodplain waterbodies", they are two possibilities: 1 with a: "poorly defined traces in water-satured substrates" becoming b1: "Meniscate burrows in emergent sofgrounds" then c1: "Striated burrows in subaerally exposed firmgrounds" (b1 + c1 = Scoyenia ichnofacies) or 2 with a becoming b2: "well definided traces in submerged sofground" (Mermia ichnofacies) becoming b1, directly c1 or c2: "obliteration of animal traces by root traces".
These two last ichnogenera of this Scoyenia assemblage, specify a fluvial system with "abandoned or inactive channel deposits" in which feeders produce meniscate traces.
With the horizontal meniscate traces Scoyenia and the Permichnium trackways, both due to insects and Octopodichnus, may be produced by arachnids, the previous traces constitute an assemblage that define the Scoyenia facies.
contains full relief, hypichnial, meniscate backfilled horizontal burrows (cf.
Exclusively simple meniscate burrows (Taenidium barretti (Bradshaw)) are preserved endichnially within horizontally laminated and, occasionally climbing-, current-rippled red sandstones that interbed with horizontally laminated red mudstones and siltstones.