Aggregate Sources in San Diego County

• Stadium/Poway Conglomerate
• Peninsula Range: Granitic Rock
• Santiago Peak Formation: Metavolcanic
• Alluvial Valley: Sand and gravel

Stadium/Poway Conglomerate Stadium/Poway Conglomerate is a mixture of sand, rock, and dirt.

Peninsula Range: Granitic Rock The Peninsula Range consists of granitic rock, an abundant resource for the construction aggregate industry in San Diego County.

Santiago Peak Formation: Metavolcanic The Santiago Peak Formation provides San Diego's construction aggregate industry with metavolcanic rock.

Alluvial Valley: Sand and gravel Alluvial valleys, or rivers, are San Diego's most abundant source of sand. However, regulations and depletion have essentially halted sand production in San Diego County requiring large importation projects for sand, mainly from Mexico, Riverside and Imperial Counties.