Supplemental Graphic 1 - Compound Basin

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This is a close-up of the “compound” basin shown at “X” in Sup2, after a rain had temporarily filled it. The water, of course, delineates yet another overall “basin” shape: note the “spillway” link of the two basins at right. The point is that the basins generally here are quite irregular indeed and furthermore are inset into an undulating and irregular surface - the undulations and irregularities of which themselves might be disputed at times as to whether natural or artificial. It is not entirely academic to ask if this is one, or two or even three basins here - or one basin with three parts, or…? Without defined parameters of what is, or is not to be included, speculation will always run rampant.