Ubinas II is steeper and rises above the Ubinas I shield. It consists mainly of lava flows but also several lava domes with accompanying block-and-ash flows, all of which formed between 261,000 ± 10,000 and 142,000 ± 30,000 years ago. A lack of more recent volcanic outcrops suggests a period of dormancy lasting until 25,000-14,700 years ago during which glaciation took place on the volcano.