Radiometric dating of the oldest rocks on earth
The first major episode of eruption formed much of the volcanic rock exposed in the central New Territories.
These rocks are dominantly crystal-rich ashes containing abundant rock fragments.
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Although the caldera that produced the ash has long since disappeared, its approximate location can be determined from the concentration of volcanic vent-type materials and the associated plutonic rocks.
Evolution & Ecology " (see its HOME PAGE .) The result is that some areas, such as the glossary are shared.