Stonehenge 181
Image by Chance
Stonehenge

Stone shifting 5

Steve, on the subject of your question, how did they get the trilithon stones through the sarsen circle, it seems that the sarsen circle did indeed pre-date the trilithons by a long time and with some degree of certainty.

However, I came across this statement:
"Of the 30 standing Sarsens, only one is of an uncertain date".

That'll be it then, I'd imagine.

Interesting. I presume that the dating methods involve samples taken from the holes, which would fit with one being removed for access.

With only one sarsen removed it would be quite difficult to "row" the trilithon stones through the gap.