Gravel
| Produces | Gravel pit |
| Production of |  Concrete |
| Upgrade factories |  Oil refinery |
| Upgrade HQ | L2 (750 000) |
| Recycles from |  Fossils |
Gravel| Produces | Gravel pit |
| Production of | Concrete |
| Upgrade factories | Oil refinery |
| Upgrade HQ | L2 (750 000) |
| Recycles from | Fossils |