This map of the elevation of the top of the titled boundary is based on query system that follows the unconformity or contact between strata above and below regardless of possible truncation or onlap of most age-constraining units. Light blue contours represent higher elevations and darker blue contours represent deeper elevations. For the shallower Cenozoic and Mesozoic maps I have use an individual query system to find the values. Control is shown by the small black circles. For the deeper Paleozoic maps the values have been derived from a combination of the same query system and the addition of layers derived from the individual chronostratigraphic isopach maps found in Map Matrix I.
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