Locally Sponsored Research

Guam Hydrologic Survey

Generalized Geology and Stratigraphy of Guam

This poster consolidates and summarizes the current knowledge of the geology of Guam. Under GHS sponsorship, Siegrist and Reagan (2007) recently updated the original geologic map of Tracey et al. (1964) to incorporate revisions of the volcanic stratigraphy and new limestone units that had been identified by subsequent research. Updated composite stratigraphic columns, keyed to the map, are shown on this poster, along with a correlative chronology of the major events in the geologic evolution of the Western Pacific region.

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