|In general, rock / sediment can be grouped into 4 units, namely:
1. Old Volcano Rock (qTv); This unit is located in the eastern part of the lava flow, pyroclastic flow and pyroclastic fall.
2. Wolonekowe Volcanic Rock (vw); These rock units are found in the eastern and western parts of lava flows, pyroclastic flows and pyroclastic fall. The Wolokowe Volcanic Group is within the caldera structure of the Old Volcano
3. Wolobobo Volcanic Rock (Vwo); These rock units are present in the northern part of the lava flow, pyroclastic flow and pyroclastic fall. The Wolobobo Volcanic Group is within the caldera structure of the Old Volcano
4. Rock / Primary Deposition of Inie Rie Volcano; This rock unit is the result of the central eruption of Mount Inie Rie consisting of lava flows, pyroclastic flows and pyroclastic fall. pyroclastic block and ash flow deposits.The structures found in Mt. Inie Rie and its surroundings are the caldera structure, the depression zone (graben), the caesarean structure, and the structure of the volcanic alignment. The remainder of the caldera wall is visible on the north-west and southeast slopes. Two fault faults namely Wai Awa and Wae Bela fault located in the west and east of Mount Inie Rie which is a normal fault trending southwest-northeast. Both of these faults are part of the edge of the depression zone. While the volcanic structure is located in the northeast which is the straightness of the emergence of the old cone of volcano represented by the north-south trending Wolobobo cone.