Re: [Xenozoic Tales / Cadillacs and Dinosaurs] Lost technology idea needed.
Geothermal power generation is already around, so that's taken.
I don't think the radiation idea would work out, as an atomic bomb has been shown...and it was more or less made clear that it is dangerous, so the prospect of radiation being able to heal is iffy at best.
Mind control might work as a one off "tool" of a villain, but it doesn't suit my needs. I have in mind a discovery that would benefit many, if not all, people.
How far west do you envision PCs would have to go before finding such deposits and/or stockpiles?