Doing a quick map of Mesolithic populations and realised it doesn't really show something.

In fact the WHG (they're looking to call it the Villabruna cluster now) was by far the dominant population, contributing significantly to the SHG and EHG populations and there was WHG gene flow into Anatolia too.

And yes this is showing modern sea levels, don't start crying about Doggerland, just let it go.