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The instantaneous isochron attribute is defined as the change in seismic time with respect to relative chronostratigraphic time. It can be computed by taking the derivative of a horizon volume used for volumetric flattening. In an example from Angola, the horizon volume is computed automatically with a global algorithm that picks every horizon in a 3D dataset. The instantaneous isochron attribute derived from this provides a dramatic view of the geomorphology of a turbidite sequence.