About this map:

This map shows in detail the structural geology of northern Guam. The geospatial information was taken from the detailed geologic map of Guam, produced by Siegrist, H.G. and Reagan, M. (2008) as a reinterpretation and revision of the Geologic Map of Guam by Tracey et al. (1964). The map was georeferenced and individual features digitized.