I noticed that there were not one but two horses at last week's Kentucky Derby with names related to somewhat geological topics.
First there was Gemologist. A gemologist is, of course, someone who studies gems.
Then there was Sabercat. Sabercat is a term used for extinct felids such as Smilodon, which were once known as sabertoothed tigers, but which were not closely related to modern tigers.
(The Kentucky Derby website has a page for each of the horses, as linked above, but the information there was mostly genealogical. I wish that the pages had included more personal details, such as the horses' favorite movies and television shows, where the horses went to college, and who their horse role models are.)