Hanrasan Mosewat Yumunamjil Gakryeogam Jidae

Basic information

Designation

Natural Monument No.582

Category

자연지형

Era

신생대

Designated year

2025

Location

서귀포시, 제주특별자치도— 제주특별자치도 서귀포시 서홍동 산 1-1 일대

Coordinates

33.345750, 126.524841Kakao address conversion

This English description was machine-translated and may contain inaccuracies. Refer to the original Korean text for details.

The Hallasan Moseswat Rhyolitic Breccia Zone extends approximately 2.3 kilometers in the region southwest of Baengnokdam on Hallasan Mountain's outer area, formed approximately 28,000 years ago by pyroclastic flows resulting from the collapse of a small lava dome. Previously only dark-colored basaltic rocks were known to exist in Jeju; the discovery of light-colored rhyolitic rocks formed in the final stage of magmatic differentiation holds great significance. The rhyolitic breccia of confirmed generation age is found within comparatively extensive surface sedimentary layers with light coloring easily distinguished from surrounding rocks, serving as a key bed providing crucial evidence for interpreting the deposition sequence of Hallasan high-altitude volcanic sedimentary layers. This represents geological heritage of high scientific value exemplifying characteristic cross-sections of past Hallasan high-altitude volcanic activity.

Location