Maybe ..... but remember this is only a simplistic schematic...

Maybe ..... but remember this is only a simplistic schematic diagram of what has happened. There are a lot of factors which influence what has happened especially river size and flow rates and pooling size to enable the dropping of the sediments(sands) from the turbid water etc.
From memory the carbonate structure that they discovered with the one well that has been drilled (Moosehead 1) in PEL 87 was caused by a volcanic event and showed up (I think) on 2D seismic as a drilling hot spot.
The subsequent 2D data analysis, with the benefit of the drill results from Moosehead 1, has identified the massive Saturn prospect.
The analysis of the information by Oldgeo,V10, Alexii and others from their working knowledge is, IMHO, so beneficial to those of us who are following PCL that words fail me in my feeble attempts to thank them .... please keep it up .....