Dark Syrtis Major (EDM - Natural Colors; credits: Dr Paolo C. Fienga - Lunexit Team)

In this EDM of Syrtis Major, ancient Noachian Bedrock is exposed. This is rock made in the early Soles of Martian History.
An Impact Crater (about 50 Km in diameter) into this rock exposes Layers along its Wall. These Layers may be made from several different geologic materials, such as Lava Flows, Debris from nearby impact craters, or deposits of Dust or Sand.
They may also represent different periods of deposition and erosion. The Layers are of varying thickness: some of the lighter, resistant units are less than 10 meters thick, while some of the darker layers might be over 100 meters thick.