The Post Track and Sweet Track causeways are constructed in the Somerset Levels. (jan 1, 3840 BC – jan 1, 3800 BC)
Description:
https://en.wikipedia.org/wiki/Post_Track
https://en.wikipedia.org/wiki/Sweet_Track
Added to timeline:
Date:
jan 1, 3840 BC
jan 1, 3800 BC
~ 40 years
Geo: