Economic and Environmental Geology

Fig. 3.

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Fig. 3. Photographs of the (tuffaceous) sedimentary rocks in the Jeonggaksan Formation. (a) Outcrop photograph of well bedded, laterally persistent Jeonggaksan Formation. (b) Close-up view of the sandstone-mudstone couplets. (c) Convolute laminations (arrows) formed by a series of load and flame structures in the sandstone-mudstone couplets. (d) Outcrop photographs of (tuffaceous) normally graded sandstones with sharp or erosional lower boundaries (dashed line). (e) Close-up view of a (tuffaceous) normally graded sandstone. (f) Close-up view of planar stratifications in the upper part of the (tuffaceous) normally graded sandstones.
Econ. Environ. Geol. 2022;55:295-307
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