Contour

Contour lines showing a plateau. From Wikimedia Commons.

Contours are lines on maps which connect equal values. These may be elevations (structure and topographic maps), true thicknesses (isopachs), measured thicknesses (isochores), differences between two seismic events or reflections (isochrons), or any variables that can be mapped.

See also

• Subsurface maps
• Contouring geological data with a computer

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