| The Decade of North American Geology (DNAG) gravity grid values, spaced at 6 km, were
used to produce the Gravity Anomaly Map of North America (1987; scale 1:5,000,000).
Considerable caution should be exercised when using these gridded data in regions
of sparse coverage (for example, deep oceanic areas). The spatial distribution of
the original data from which the grid was generated is shown on sheet 5 of the published
map. Note: There are no gridded data values for Mexico. |