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Echinoderm grains showing cloudy appearance due to the presence of abundant inclusions. Minute inclusions are also observed in syntaxial overgrowth, but abundance is less than host grain. Micritic envelopes are well developed Ordovician Yeongheung Fm. Photo courtesy of Dr. CM Yoo |
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Gastropod showing no internal microstructure due to complete dissolution of aragonite and subsequent filling by calcite. Scale bar is 300micrometers Ordovician Yeongheung Fm. Photo courtesy of Dr. CM Yoo |
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Stylolite cross-cut the replacement dolomite crystals. Ordovician Yeongheung Fm. Photo courtesy of Dr. CM Yoo |
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Photomicrograph of brachiopod showing excellent preservation of their original laminar foliated layer. Pseudopunctate is well developed Ordovician Yeongheung Fm. Photo courtesy of Dr. CM Yoo |
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Saddle dolomite cements are developed in the cavity after evaporite nodule dissolution. The dolomites were dissolved partially as evidenced by the corroded cement margin and subsequently filled by very coarse sparry calcite shown in the lower half of the photomicrogarph Ordovician Yeongheung Fm. Photo courtesy of Dr. CM Yoo |
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Deformed peloids. Relatively competent ooids (oval shape) are remained in less deformed state. White wavy and anastomosing bands are sparry calcite cements formed earlier than compaction Ordovician Yeongheung Fm. Photo courtesy of Dr. CM Yoo |
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Fossiliferous grainstone. Bioclasts are cemented by blocky sparry cements. Micritic envelopes are well developed in fossil fragments Ordovician Yeongheung Fm. Photo courtesy of Dr. CM Yoo |
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Fossiliferous packstone. Bioclasts are randomly distributed in lime mud matrix. Well developed micritic envelope is observed in crinoid fragment. The inside pores of some gastropods are filled with dolomite rhomb. Trilobite fragments and disarticulated ostracods are visible also Ordovician Yeongheung Fm. Photo courtesy of Dr. CM Yoo |
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Crinoid fragment with micrite envelopes Ordovician Mungog Fm. Photo courtesy of Dr. JI Lee |
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Gastropod. Ordovician Mungog Fm. Phto courtesy of Dr. JI Lee |
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Radial ooids. The original radial textures are well preserved and this means the original mineral of these ooids was probably calcite Ordovician Mungog Fm. Phto courtesy of Dr. JI Lee |
