Atacama's lessons about life on Mars

I'd seen related material before, on here as well as elsewhere, I'd suppose it biologically feasible, certainly, I've been well aware of microbial findings in inhospitable environments for quite some time, certainly here, geothermal vents at deep ocean depths, as well as on the surface. It's by no means inconceiapvable, merely a matter of extraordinary luck finding the right site, or knowing what the right signature would be....