why so close together? any opinions

[longtimefree]

very interesting read n2rklog and cmd, do not know when i will be out that way again, but next time i will take a tape measure and also take some pics of the rock art that resemble spiral galaxies done in red ocher, thanks again for your response and interest i will be contacting my friends to see if there are any more examples known locally

[MarkO]

Those pictures fascinated me the other day when I came across them

They remind me of "hardness blocks" I used in calibration laboratory work. We would use as much of the hardness block (testing metals to Rockwell Hardness standards) as practical before turning it over and often using the backside as well before discarding it.

In that context the nearby holes would have lost "utility". At a certain depth they might/must have become innefficient to the user.

I can't imagine people working that closely to each other smashing nuts. One person is hand placing the next nut in the hole while the work mate is smashing with rocks six inches away? Not likely - a smashed finger and the possibility of infection in those days would be more risk than these smart people would have assumed. You lose your value to your tribe mates and then what? Smashing that closely is a certain accident scenario over time.

My very amateur rock opinion...is that logically the deeper holes have lost utility - I guess they should be the older holes if such a thing were measurable.