I always thought "Archangel's Thunderbird" was a sixties example of punk. There was also an Amon Duul I that were much more political. AD2's bassist, Lothar Meid, also did some solo work. I had one of his albums from way back when.

Another really good band from that era was White Noise, whom I believe were from England. Really great English-folk-rock mixed with electronix and tape FX that were really innovative. I think the bandleader was David Voorhees or something. "Black Mass: An Electric Storm" was a good example.