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Siccar Point, Berwickshire. The rugged point shows gently sloping beds of 345 million year old Devonian Old Red Sandstone above vertical beds of 425 million year old Silurian greywacke.
The upper angled layer of grey dolomite is approximately 500 million years old. The reddish rhyolite on which the dolomite rests is approximately 1.5 billion years old. There is a billion years of geologic history missing in this picture. Missouri Ozarks.

An unconformity is a gap in the sequence of rocks in a geologic column. It is a buried erosion surface separating two rock strata of different ages. It shows that sediment deposition was broken for a time, usually because the land was above sea level at that time.

Usually, the older layer was exposed to erosion for some time before deposition of the younger. However, the term is used to describe any break in the sedimentary record.

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