Funnel beaker culture then? The dolman points to that as well as the date, I think.
I don’t know though. I just like prehistory.
EDIT: No mention of grave goods, though the article mentions that the dolman is not typical of the passage graves found around 200 years later.
I find this region fascinating because it lies on the outskirts of the Neolithic farmer expansion (and other explanations from the East), so the arising culture seems to be more of a conversation between new cultures and preexisting cultures.
The megalithic neolithic Atlantic culture that seems to stretch from Portugal to Scandinavia is fascinating too.