 The name "Jura" is derived from the Celtic root "*jor" via Gaulish "*iuris" "wooded mountain", which, borrowed into Latin as a place name, evolved into "Juria" and finally "Jura".The chronostratigraphic term "Jurassic" is directly linked to the Jura Mountains, a mountain range mainly following the course of the France–Switzerland border.During a tour of the region in 1795, Alexander von Humboldt recognized the mainly limestone dominated mountain range of the Jura Mountains as a separate formation that had not been included in the established stratigraphic system defined by Abraham Gottlob Werner, and he named it "Jura-Kalkstein" ('Jura limestone') in 1799.