 The paper identifies and characterizes three major building stones used in the construction of the Roman city of Lyxus, Larache, Morocco through petrographic and petrophysical techniques. These lithotypes are oligosine sandstones, quaternary sandstones, and quaternary conglomerates. The study reveals that these stones differ in grain size, ratio of detrital to allochemical components, and the configuration of their porous system. Mechanical analysis shows that the oligosine sandstones are more resistant to compression than the quaternary sandstones and conglomerates. Petrographic results indicate that lithotypes differ notably in grain size, ratio of detrital to allochemical components, and the configuration of their porous system. The oligosine sandstone is the primary building stone in Lyxus as it forms and crops out extensively in the Thymus hill at the top of which the city is settled. The quaternary sandstones and conglomerates, which represent near shore deposits and eolianites, crop out along the Atlantic coast where they form part of the cliffs next to Larache. The study indicates that the relatively fine state of conservation of the building rocks of Lyxus is linked to intrinsic factors such as mineralogy and petrophysical characteristics together with the favorable effect of the climatic condition of the steady area. This article was authored by T. Aginaf, D. Gomez-Graw, Anavaro, and others. We are article.tv, links in the description below.