The dura mater has two layers, or lamellae: The superficial layer (also called the periosteal layer), which serves as the skull's inner periosteum, called the endocranium; and a deep layer called the meningeal layer; the actual dura mater.
The term thagomizer was coined by Gary Larson in humor, in a 1982 Far Side comic strip, in which a group of cavemen in a faux-modern lecture hall are taught by their caveman professor that the spikes on a Stegosaur's tail are so named after the late Thag Simmons.
Answer: Gary Larson. Gary Larson, the beloved cartoonist behind the quirky single-panel cartoon The Farside, is popular in geeky and scientific circles. So popular in fact that jokes and references from his collections often work their way into scientific lingo and discourse.