I wrote most of Igneous Range before I had any idea I was writing a Jeffers novel, thematically anyway: violence, vultures, redwoods, defiance, and above all fire. A repeating theme is the dominance of the subconscious, and there is also a sense of insanity.
Oh, and there’s genocide as well.
Toward the end of the story, Armen encounters a crazy old man in a cave who preaches the insanity of man. He does not mean that man is evil; only that man is not rational:
There are lots of intelligent animals, but there is only one mad animal.