unmistakable contours of ancient water flow, running roughly northwest to southeast
as if the City were located on the western bank of a great waterway, many miles wide
(to give you an idea of scale, The Face is a mile and a half long and a half a mile wide)
but these markings are on top of the fainter, more regular, seashore edge elevations
(many smaller tributaries and streams can also be made out, throughout this image)
as if a very high volume of water rushed suddenly past here - and then nothing more
compare to spectral image (below right) showing where the long-standing water was.
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