Stratigraphy: Triassic granitic rocks with a magmatic crystallization age of approximately 236.3 ± 0.8 million years before present.

Distribution: The Deep Bay Granite subcrops offshore to the west of the Deep Bay Fault in the western New Territories.

Lithology: Deep Bay Granite consists of weakly deformed, equigranular fine-grained two-mica leucogranite.