The report summarizes all the dates known to have been run. The dates of the US. Geological Survey are adopted. Most of the dating in the past 7 years have been on samples from Luzon. Dates are from various sources and largely unpublished and in many cases, the full data for
evaluation of reliability are not available. Some of the dates may be questionable which may result in some changes at a later time, but most are probably valid.

The current ideas on the tectonics of the archipelago is reviewed and a brief geologic summary of Luzon is given.