Latest Cretaceous and Cenozoic magmatic rocks of Alaska: polygon data

This map is a statewide summary of magmatic (igneous) rocks
grouped into geologic units that can be portrayed
cartographically at 1:2,500,000.
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.
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).