[2] In 1938 he took charge of the geological and paleontological collection of Chilean National Museum of Natural History by request of Ricardo E.

[citation needed] Fuenzalida championed the establishment of a geology degree in the University of Chile, leading a successful effort in 1961.

[1] In the 1926–1930 period Fuenzalida studied in Sorbonne, Paris with teachers such as Emmanuel de Martonne, Émile Haug and León Lyteaud.

[2] The work of Fuenzalida spanned the whole Chilean territory, studying the geology around Puelo River, the volcanoes of Maule Region (Quizapu, Descabezado Grande, Descabezado Chico), Arauco Basin, Magallanes Basin, plus the South Shetland Islands in Chilean Antarctica.

[2] Subjects he dealt with include sea-level change, the Andean orogeny (within a Geosynclinal theory framework), volcanism in Chile and Antarctica, sand dunes, economic geography, and reflections on figures such as Juan Ignacio Molina, Claudio Gay, Diego Barros Arana and Ricardo E.