Caitlin Kiernan’s early novel Threshold has things to say about Georgia trilobites, drawing a their experience as a paleontologist before turning full-time to fiction. They turn out to be things that do not make the characters glad to know. Lovecraftian things. Great stuff.It started out with Megalodon teeth but I ran across a sweet trilobite a few years ago I managed to get for a song and it was on.