Thanks for your input. I always thought that—along with Y-dna A and C—mtdna L was a surviving lineage of the original Eurasians. That’s why mtdna L and Y-dna A are found in Northern Europe and parts of West Asia. Is there an ancient mtdna database online by chance? I am still trying to find a link to that L2a1 Tell Halula sample.
mtdna L and y-dna A must been recent commers to Northern Europe, they never were found in Paleolithic and Neolithic samples to date. There was a minor hypothesis that y-dna E and mtdna L3 were in fact Eurasian coming back to Africa, but it's hard to conciliate with the datas, y-dna E was found in the Levantine Natufians but not mtdna L3 ( or any other L ). I didn't know about the Tell Halula sample until you spoked of it, and i cannot found anything in the prehistoric samples interactive map i used in general. There was a website from Jean Manco wich repertoriate an amazing set of samples from almost every studies on ancient dna, but unfortunately she past out and the website eventually shut down. But even, i dont recall have found an L2 from Tell Halula in her tables.
The only prehistoric mtdna L samples i know are:
Mota 1, Ethiopia, 2'500 BC: Y-dna E1b1, Mtdna L3X2a.
Pastoral Neolithic, Tanzania, 1200-940 BC: mtdna L2a1.
Malawi Stone Age, Malawi, 700-400 BC: mtdna L0f.
Nachikufu, Malawi, 8000-3000 BC: Y-dna BT, Mtdna L0K2.
And a few prehistoric HG's from South Africa, all y-dna A and mtdna L, probably ancestors of Khoikhoi people.
Also one of the Guanche sample from the Canaria Islands was: Mtdna L3b1a.