[Fred Nerks]

People look for explanations based upon the familiar. That doesn't always work. Who and for what reason would create this, in an ancient lake bed?

If you follow this on Google Earth, it spreads out over an incredibly large region, what you see here is just a small, concentrated portion.

[Oatka]

[Photo wide area of "petroglyphs", etc.]

And Pisco Valley, Peru. More "natural erosion". Length: approximately 1,450m; Width: approximately 20m; Number of holes estimate: 6,900

IMO, too many anomalies are written off as "natural" and I think part of it is due to people advancing theories that have gained even slight acceptance. They in turn become solidified as Holy Writ and all efforts are directed to defending that theory, to the point of ruining peoples' careers. Then the major protagonist dies and those who no longer have to fear of being ostracized as heretics, come up with an alternative, and usually a better interpretation.

Some wag, familiar with that dark side of science, opined that science progresses from funeral to funeral.

I think he's on to something.