This work synthesizes the data collected in the analysis of the petreal materials used in construction of the
Monastery of Santa María de Raíces in Asturias. The most probable area of origin of those is show with the
purpose to identify the transport done during its construction. Macroscopic and microscopic petrologic
analysis and bibliographic and field study allow to conclude that there exists a great litologic variability.
Carbonated and siliciclastic materials are show, with ages ranging from Devonic to Jurasic. Possible supply
areas are proposed, belonging in most cases to close surroundings, inferior to 7 km