A graphic display summarizing the stratigraphy of a particular area. The vertical scale represents geologic time, the horizontal scale represents distance, and the time-range and geographic extent of known stratigraphic units are plotted against these two variables. A range of information, obtained from seismic sections, well-logs, outcrops, etc., is shown on the chart. This may include lithology, bounding unconformities at the top or bottom of depositional sequences (see baselap; downlap; onlap; and toplap), the position of known lithostratigraphic units, facies changes, and the location of wells. See also seismic stratigraphy.
Subjects: Earth Sciences and Geography.