Yumunamjil Dangoe on Donggeochado Island, Jindo

The rock of Donggeochado Island is presumed to be peperite, formed when silicic or acidic magma — rising through the crust as a network of dykes — mixed with volcanic ash that had accumulated near the surface. Peperite often forms where sedimentation and igneous activity (particularly the intrusion of magma or the effusion of lava) occur at the same time, making it a rock that greatly aids the interpretation of the nature and timing of past geological processes. The Yumunamjil Dangoe on Donggeochado Island, Jindo, takes the form of silicic dykes that have broken off into rounded concretionary masses. This gives it the general importance of peperite as a rock type, but it also carries significant academic value for interpreting how silicic peperite forms. Note: This designation was renamed from 'Jindo Donggeochado Orbicular Peperite' to 'Jindo Donggeochado Yumunamjil Dangoe' (announced 26 July 2021).

AI Translation

Where it is

Region

Jindo, Jeonnam & Gwangju

Designation

Natural Monument · 천연기념물