Southern Guam geospatial information server

Surface geology:
General map by geologic epoch

About this map:

This general geologic map of southern 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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(full map)

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(south Guam only)

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(main layer only)

GIS
(entire Guam)

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