This dataset consists of a polygon coverage and associated attribute data derived from the 1994 map "Latest Cretaceous and Cenozoic magmatic rocks of Alaska" compiled by E.J. Moll-Stalcup, D.A. Brew, and T.L. Vallier. This map was originally published (at 1:2,5000,0000) as Plate 5 in Volume G-1, "The Geology of Alaska", edited by G. Plafker and H.C. Berg, and published by the Geological Society of America (GSA). Volume G-1 (The Geology of Alaska) is one of a series published by GSA for the Decade of North American Geology (DNAG), and is often referred to as the DNAG-Alaska volume.
The map (Plate 5) is a statewide summary of magmatic (igneous) rocks grouped into geologic units that can be portrayed cartographically at 1:2,500,000. This digital dataset includes all 44 magmatic rock units from the original map, including dredged and outcrop sampled areas. It includes attributes for rock age (6 groups), composition (8 groupings), ranges and combinations of age and composition; and the location of hypabyssal or agglomeratic/tuffaceous units (TYPE = H or T) This coverage is not intended to be a complete representation of the printed map. It does NOT include the following features: locations of calderas or volcanoes; inset maps of magmatic provinces; or explanatory text (introduction and references).
