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<p>The Wagok Formation (Yeongwol Group, western Taebaeksan Basin) is a ~ 172&#xa0;m-thick massive dolostone unit whose internal stratigraphy and depositional history have remained poorly constrained due to extensive dolomitization. Here we apply a high-density sampling strategy (270 samples at ~ 0.6&#xa0;m spacing) and integrate conventional petrography with two complementary optical techniques, backlit diffused-light imaging and “white card” reflected-light microscopy, to reveal the primary sedimentary fabrics obscured by recrystallization. These observations allow recognition of lime mudstone, wackestone to packstone, peloidal and intraclastic packstone to grainstone, oncolitic packstone to grainstone, oolitic grainstone, limestone pebble conglomerate, stromatolitic boundstone, and dendrolitic boundstone. Facies associations support deposition on an open-marine shallow carbonate platform characterized by offshore lime-mud flats and shoal complexes, with an overall shift from relatively inner-platform conditions to a mud-dominated outer-platform setting and back to shoal-dominated inner-platform conditions. Integration with published conodont and trilobite biostratigraphy enables correlation with time-equivalent units in the eastern Taebaeksan Basin and highlights a marked contrast between a thick shallow-marine carbonate succession in the west and a thinner, deeper siliciclastic-dominated succession in the east. The Wagok Formation therefore provides a reference framework for evaluating basin-scale paleogeography and platform development near the Cambrian–Ordovician transition, while illustrating that even pervasively recrystallized dolostones can preserve recoverable depositional information when examined using the optical workflows applied in this study.</p>

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Reconstructing a depositional model for the massive dolostone of the Wagok Formation (Cambrian stage 10), Yeongwol Group, Korea

  • 期刊论文

  • 发表日期：

    2026年3月27日

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  • Jino Park,
  • Jongsun Hong

摘要

The Wagok Formation (Yeongwol Group, western Taebaeksan Basin) is a ~ 172 m-thick massive dolostone unit whose internal stratigraphy and depositional history have remained poorly constrained due to extensive dolomitization. Here we apply a high-density sampling strategy (270 samples at ~ 0.6 m spacing) and integrate conventional petrography with two complementary optical techniques, backlit diffused-light imaging and “white card” reflected-light microscopy, to reveal the primary sedimentary fabrics obscured by recrystallization. These observations allow recognition of lime mudstone, wackestone to packstone, peloidal and intraclastic packstone to grainstone, oncolitic packstone to grainstone, oolitic grainstone, limestone pebble conglomerate, stromatolitic boundstone, and dendrolitic boundstone. Facies associations support deposition on an open-marine shallow carbonate platform characterized by offshore lime-mud flats and shoal complexes, with an overall shift from relatively inner-platform conditions to a mud-dominated outer-platform setting and back to shoal-dominated inner-platform conditions. Integration with published conodont and trilobite biostratigraphy enables correlation with time-equivalent units in the eastern Taebaeksan Basin and highlights a marked contrast between a thick shallow-marine carbonate succession in the west and a thinner, deeper siliciclastic-dominated succession in the east. The Wagok Formation therefore provides a reference framework for evaluating basin-scale paleogeography and platform development near the Cambrian–Ordovician transition, while illustrating that even pervasively recrystallized dolostones can preserve recoverable depositional information when examined using the optical workflows applied in this study.