Economic and Environmental Geology

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Fig. 4.

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Fig. 4. Photographs of the Duwon Formation with the underlying basement and the overlying Goheung Tuff. (a) Paleoproterozoic porphyroblastic gniess. (b) Outcrop view of the Duwon Formation composed of basement-derived siliciclastic sediments. (c) Photograph of the tuffaceous sediments in the upper part of the Duwon Formation. Broken K-feldspar crystals are noteworthy. (d) A sharp and planar boundary between the Duwon Formation and the overlying Goheung Tuff.
Econ. Environ. Geol. 2021;54:441-56 https://doi.org/10.9719/EEG.2021.54.4.441
© 2021 Econ. Environ. Geol.