Lugones' "Origins of the Flood"

This is the most Lovecraftian of the Lugones' stories so far as Lugones' narrator reveals a prehistoric vision of life on earth that is as vast and alien as that of "At The Mountains of Madness." The narrator is unidentified at first, but near the end of the story we learn that it is a medium channeling the thoughts of one of the few proto-human survivors, a creature which is (in adding to the overall Lovecraftian vibe) half-woman/half-fish and as white as the moon. Again, there is some pretty dense pseudo-science describing the strange chemistry of prehistoric life. The science is particularly dated, as Lugones suggests elemental transformatios versus chemical (as opposed to nuclear) reactions, which we now know is impossible; but it's still sort of fascinating, an attempt to ground the fiction in theory.