Mind you, so did every other HN commentator and it's something that rarely comes up when forums speculate on the transport of stones in the UK for ancient monuments.
It's easier to stack up the "weird non local" stones dropped at the end of a valley after a glacial retreat than it is to transit them ~1,000 km without a crane and a truck.
utterly failed to mention glacial erratics.
https://en.wikipedia.org/wiki/Glacial_erratic
https://www.cyark.org/projects/okotoks-erratic/overview
Mind you, so did every other HN commentator and it's something that rarely comes up when forums speculate on the transport of stones in the UK for ancient monuments.
It's easier to stack up the "weird non local" stones dropped at the end of a valley after a glacial retreat than it is to transit them ~1,000 km without a crane and a truck.