Stonehenge's Altar Stone came from Wales

What actually happened

For a century the Altar Stone was lumped in with the other bluestones and assumed Welsh. The 2024 analysis, led by a Curtin University doctoral student, dated tiny mineral grains, zircon, apatite, and rutile, in fragments of the stone and found a fingerprint about 90 percent matching Old Red Sandstone from the far north of Scotland, and clearly not matching Wales.

The distance is the astonishing part. Moving a five-metre, six-tonne slab from northeast Scotland to Salisbury Plain, across or around the entire length of Britain, implies either a feat of overland haulage across mountainous terrain or, more plausibly to the authors, transport by sea around the coast. Either way it points to a Neolithic society far more connected and coordinated across Britain than the standard picture allowed.

This is a clean 'updated' correction: the bluestone-from-Wales story is still true for most of the smaller stones, but the single most important stone at the heart of the monument has been reassigned to a different country, and the textbook sentence tying the Altar Stone to Preseli is now simply wrong.