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A wavy line marking missing time in a rock sequence.
Also known as: Erosion surface marking, Non-conformity marking
An unconformity is a surface where a gap in the record exists — rock was eroded away or never deposited — and is drawn as a wavy or irregular line. The gap can represent millions of years, and the line is the only mark on the section standing for time that is absent.
Marks a break in the geological record, drawn as a wavy or irregular line between rock units.
Contexts: Technical drawing, Maps
Represents time that is missing rather than rock that is present, so the line stands for an absence of record.
Contexts: Technical drawing, Maps
An irregular wavy line drawn between two areas of a geological section, its undulations uneven.