Gravel - Wikipedia. Gravel /ˈɡrævəl/ is composed of unconsolidated rock fragments that have a general particle Crushed stone: rock crushed and graded by screens and then mixed to a Also known as "crusher run", DGA (Dense Grade Aggregate) QP (Quarry In locales where gravelly soil is predominant, plant life is generally more
So getting right to it then, what type of foundation are we going to build for our flagstone patio: sand, cement, or gravel?. Short answer: well it depends. Quarry screenings (if available in your area) are generally best for under the flagstones.