North Polar "Unconformities" (Original NASA/MGS/MSSS b/w Frame)

Caption NASA originale:"This MGS-MOC image shows Layers exposed in the North Polar Region of Mars. The North Polar Cap is underlain by a thick sequence of Layered Material. The Layers are most commonly exposed on the slopes of troughs that are believed to have formed by Wind Erosion. The Layers give a banded appearance. In this example, some of the Layers are cut off (truncated) by other Layers. This truncation is a classic, textbook example of an Erosional Unconformity, a term commonly used by geologists. The Unconformity occurs when deposition of new layered material stops for a while and erosion occurs. Then, new layers form on top of the eroded surface and the older layers, at some point in time when the erosion stops and deposition of layered material resumes".

Location near: 78,6° North Lat. and 342,0° West Long.
Image width: ~3 Km (~1,9 mi)
Illumination from: upper right
Season: Northern Spring