Thin black diagonal line - fault cuts across and offsets units 1 and 2, but does not offset 4. 2.
Granite has cracks that are filled by the intrusion, and the granite is therefore older.
The purple unit is therefore younger than the craters and the pink unit. Impact craters cut the pink unit but are overlapped by the purple unit and are therefore younger than the pink unit but older than the purple unit. The pink grey unit is therefore older than the impact craters and the purple unit. This image shows an entire hemisphere of Ganymede. The prominent dark region, called Galileo Regio, is about 3,200 km in diameter.