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A 5cm thick gastropod layer (middle part of the photograph) which has good lateral continuity. Cretaceous Hasandong Fm. Photo courtesy of Dr. JI Lee |
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Gypsum cast in the flood plain lake deposits. Gypsum cast is formed in gypsum rock by solution. Cretaceous Hasandong Fm. Photo courtesy of Dr. JI Lee |
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Well developed mudcracks. Mudcrack is an irregular fracture in a crudely polygonal pattern, formed by the shrinkage of clay, silt, or mud, generally in the course of drying under the influence of atmospheric surface condition. Jindong Formation Photo courtesy of Dr. JI Lee |
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Calcrete on bed plane. Cretaceous Hasandong Fm. Photo courtesy of Dr. JI Lee |
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Middle Cambrian ribbon rock. Ribbon rock is characterized by a succession of thin layers of differing composition or colors shown in this photograph. Western Hill, China Photo courtesy of Dr. JI Lee |
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Oolitic grainstone. Ooids are observed clearly. Western Hill, China Photo courtesy of Dr. JI Lee |
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Stromatolite. Stromatolite is an organosedimentary structure produced by sediment trapping, binding, and/or precipitation as a result of the growth and metabolic activity of micro-organisms, principally cyanophytes(blue-green algae). It has a variety of gross forms, from nearly horizontal to markedly columnar, domal, or subspherical. Western Hill, China. Photo courtesy of Dr. JI Lee |
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Imbricated flat-pebble conglomerate. Current flew to the right. Western Hill, China. Photo courtesy of Dr. JI Lee |
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Bioturbation illustrating churning and stirring of sediment by organisms after sedimentation. Ordovician Mungok Fm. Photo courtesy of Dr. JI Lee |
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Flat-pebble conglomerate. Cross-section parallel or subparallel to the bedding plane. Ordovician Mungok Fm. Photo courtesy of Dr. JI Lee |
