Forgotten heavy bands from late 60's to early 70's

I wouldn't call them forgotten (maybe not so well known in the US), but I have to mention Hawkwind. Space Ritual is the ultimate heavy psychedelic album.

Blue Cheer, Spirit, Love...all amazing and well ahead of their time from 1966 to 1969.

Thanx for the many great selections. Sir Lord Baltimore-Boulder Damn and Night Sun are great bands that I was unfamiliar with. Also discovered Armageddon-st-1975. If your familiar with Armageddon is it worth the effort and cost to obtain an import pressing?

Sir Lord Baltimore - Currently I'm re-reading Bill Graham's autobiography (No, not THAT Bill Graham!). A tremendous book that, without trying to, explains very clearly much of what's wrong with the American music industry today, but I digress. Here's a tale about Sir Lord Baltimore I just read last night: "Dee Anthony had a group called SLB booked into the Fillmore East. They were so awful. As we were moving their equipment, we found a book on how to play guitar on the gtr players amplifier. For the rest of the weekend, we kept asking him what page he was on".

So many bands sadly, after Led Zepplin, they are all a distant second!