Martian unconformity at Mount Sharp: The line of white dots marks the contact point between the two disparate layers of rock.Courtesy NASA/JPL-Caltech/MSSS
A photograph captured by the Mars rover, Curiosity, shows an unconformity in the strata of Mount Sharp, a mountain inside nearby Gale Crater. An unconformity is a geological feature marking a stop in sedimentation and erosion of a surface before the overlying layer is deposited. The photo above shows the two distinct rock layers (marked by a line of white dots) that make up the unconformity. The upper layer, which is tilted left to right in relation to the lower layer, contains no evidence of hydrated minerals found in the lower layer. This idicates the two layers were laid down in different environments.

BBC science story
NASA site

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