Geology
Rock types are basalt and andesite. The only rocks reported to have been dated are 0.53 and 0.65 million-year-old basalts. These predate the crater collapse and formation of the lava dome known as White Rock, which could have occurred in the last 2000 years. The mountain which is believed to be several peaks merged at the top by some local people is actually a Single-Cone Stratovolcano.
Read more about this topic: Mount Arayat