Two similars for your consideration, Re: weathering

[nunyabiz111]

...sarcasm detector might need to be calibrated there, eh

 

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[Charl]

indeed they do, although given the hoodoos assumed their current form through the ages in due cause to their static/immobile (ie: "bedrocked") nature as to where glacially deposited cobbles around here still get kicked around like an empty can when subject to ice drifts and riverbed scouring (likewise, possibly becoming entombed for ages in eroded debris deposited by said forces)

native bedrock with pools of superficially deposited foreign tills and muck:


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Keep in mind that every single loose pebble/cobble/boulder you can find was once part of a geological formation hundreds/thousands of feet thick. I do not know at what stage of their existence your rocks experienced differential weathering, but that phenomenon is what your rocks are a testament to, and not human activity at all.