Cannubi’s geological substrate is formed of the typical alternation between the layers of silt- and calcium carbonate-rich marls and less calcareous sandy strata that distinguish sandy Sant’Agata Marls, similar to the situation to be found on others crus such as Villero and Bussia. On Cannubi the layers of sand are particularly concentrated in a belt running from its southernmost section (Cannubi Muscatel) across the centre of the hill to the lower part of Cannubi Boschis. The soil here is decidedly lighter as a result, enriched by the Diano Sandstone which is widespread in the subsoil of the village of Barolo and the higher part of the Preda and Boschetti crus. Away from this sandy belt, the soil becomes siltier on account of the marl holding sway over the sandy strata, which are still present but very thin. At the lowest part of the hill the geology changes again, with the sand virtually non-existent eclipsed as it is by the marl. Indeed, here we find ourselves in the presence of typical Sant’Agata Marls, completely dominated by silt, with little clay and very little sand. So we are faced with 3 geologically different substrata, even though the sandstone forms only a minimal part. Our vineyard is located at the top of the ridge that separates the Cannubi and Albarella crus, therefore part of sandy Sant’Agata Marls.