Close to the "top" of the water, in the saddle between a smaller hill to the west and Marble Hill to the east, I spotted a systematic rectangle on the west side
So then, naturally, you go up the hill just to be systematic and the little pile you saw at the beginning turns out to be the tip of an iceberg - a marker pile "iceberg" with piles getting bigger the further and further you get from that original large rectangle (my interpretation).
Over to the side (south) something to look at through the brush?
I want to emphasize the site layout that includes:
- a grid of piles on a slope,
- a rectangular structure at the high point of water adjacent to the slope.