material such as comets and asteroids. It also contains small globules of glassy material called tektites, formed in the initial impact. Discovered at Gubbio, the Cretaceous–Paleogene boundary is also visible at many places all over the world. The characteristics of this boundary layer support the theory that a devastating meteorite impact, with accompanying ecological and climatic disturbance, was directly responsible for the Cretaceous–Paleogene extinction event. Gubbio in fiction In Hermann Hesse's novel Steppenwolf (1927) the isolated and tormented protagonist – a namesake of the wolf – consoles himself at one point by recalling a scene that the author might have beheld during his travels: "(...) that slender cypress on the hill over Gubbio that, though split and riven by a fall of stone, yet held fast to life and put forth with its last resources a new sparse tuft at the top". The town is a backdrop in Antal Szerb's novel Journey by Moonlight (1937) as well as Danièle Sallenave's Les Portes de Gubbio (1980). The TV series Don Matteo, where the title character ministers to his parish while solving crimes, was shot on location in Gubbio between 2000 and 2011. Other Anna Moroni, a popular cook on the Italian daytime TV series "La Prova del Cuoco" discusses Gubbio in many of her TV segments. She often cooks dishes from the region on TV, and she featured Gubbio in her first book. Transportation The city is served by Fossato di Vico–Gubbio railway station located in Fossato di Vico; until 1945 was also operating the Central Apennine railway (Ferrovia Appenino Centrale abbreviation FAC) with a narrow gauge which departed from Arezzo and reached as far as Fossato di Vico and in Gubbio had his own railway station located in via Beniamino Ubaldi 2, now completely demolished. International relations Twin towns – Sister cities Gubbio is twinned with: Notable people Giosuè Fioriti (born 1989), Italian footballer See also Roman Catholic Diocese of Gubbio Mount Ingino Christmas Tree References External links Official website Official site of the Festa dei Ceri Gubbio at Associazione Eugubini nel Mondo website Thayer's Gazetteer Rugby Gubbio - Official Web Site Paradoxplace Gubbio Photo Pages Sbandieratori di Gubbio (flag-wavers, flag-throwers) The Gubbio Studiolo and its conservation, volumes 1 & 2, from The Metropolitan Museum of Art Libraries (fully available online as PDF), which contains material on Gubbio (see index) Period Rooms in the Metropolitan Museum of Art , from