Northern Guam geospatial information server

Surface geology (by age of units)

About this map:

This general geologic map of northern Guam conveys the age of different geologic units. The map is based on the newest geologic map of Guam by Siegrist, H.G. and Reagan, M. (2008), who reinterpreted and revised the Geologic Map of Guam by Tracey et al. (1964).

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