Looks like I did boo-boo somewhere. And I ran the numbers twice, too.
But that’s still a big sucka.
That website might have underestimated the extremophile biomass somewhat-
but even if the deep rock-dwelling life were equal in volume to the surface life it would only fill the Canyon more or less.
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SF worldbuilding at
http://www.orionsarm.com/main.html
wasnt there a thread about fitting the whole population of the US inside texas?
You’d need a really big blender, but hay, let’s give it a try!