The study and interpretation of information obtained by seismic-reflection profiling in order to construct subsurface stratigraphic cross-sections. Analysis of seismic reflections on a seismic section (see seismic record) can identify buried stratal surfaces that, when traced laterally and continuously, represent surfaces of synchronous deposition or their correlative unconformity surfaces. The character of a reflection may vary as the seismic profile moves across a facies boundary, but the continued presence of the reflection is of chronostratigraphic significance. More detailed information regarding the age and lithology of the subsurface strata may be gathered by means of geophysical well logging. See also chronostratigraphic correlation chart; depositional sequence.