Abstract
The Pyeongan Supergroup (Carboniferous–early Triassic) comprises a thick (ca. 1700m) siliciclastic succession of conglomerate, sandstone, purple siltstone, and gray/black shale, unconformably overlying the carbonate–siliciclastic succession of the Joseon Supergroup. An identical succession occurs in the Pyeongnam Basin, North Korea, where the lithologic units were initially identified. The basal conglomerates represent initial subsidence phase, accompanied by an abrupt sea-level rise and grade into a coastal plain environment with bedload-dominated braided systems. Limestone beds with marine fossils are indicative of transition to a lagoonal environment with abundant coal deposits. Black shale and gray siltstone facies indicate anoxic to suboxic conditions with limited biogenic activities. The Pyeongan Supergroup in the Yeongwol area also comprises siliciclastic deposits of conglomerate, sandstone, and shale as well as coal deposits.
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