Saripi granodiorite is equivalent to Boliyohuto Diorite (Tmbo) which is Middle Miocene to Late Miocene age and belongs to period 2 (early magmatism-volcanism) of Gorontalo. The formation process of Saripi granodiorite is interpreted to have formed about ± 13 million years ago.
Figure 1. Saripi Granodiorite
Figure 2. Hill of a Thousand Stones in Tanjung Harapan (Photo: Arfandi Ibrahim)
Figure 2. Garden Stone of Tanjung Harapan (Photo: Arfandi Ibrahim)
In the northern part of the Saripi granodiorite hill there is a hill that has almost the same characteristics. This hill is known as the Hill of a Thousand Stones and Garden Stone. The rocks in this area are interpreted as belonging to the early magmatism-volcanism period of Gorontalo.