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Sedimentary Structures
Descripción
List and description of sedimentary structures
Sin etiquetas
sediment
sedimentary structures
geology
physical science
sedimentary rocks
Mapa Mental por
Lindsay Wennerström
, actualizado hace más de 1 año
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Creado por
Lindsay Wennerström
hace más de 7 años
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Resumen del Recurso
Sedimentary Structures
Laminations
Nota:
Layers less than 1 cm thick Form mostly as particles settled from suspension
Beds
Nota:
Layers more than 1 cm thick Form as particles settle from suspension and from moving sediment as sand in a stream channel
Graded-bedding
Nota:
Individual layers with an upward decrease in grain size Deposition by turbidity currents or during waning stages of floods
Cross-bedding
Nota:
Layers deposited at an angle to the surface in which they accumulated Deposition of a sloping surface at the downwind side of a sand dune
Ripple Marks
Symmetrical
Nota:
Wave-formed ripple marks, generally with a sharp crest and broad troughs Formed by oscillating currents
Assymetrical
Nota:
Current ripple marks Result from deposition by water or air currents flowing in one direction
Mud Cracks
Nota:
Intersecting cracks in clay-rich soils Drying and shrinkage of mud along a lakeshore, a floodplain, or on tidal flats
Trace Fossils
Nota:
Indications of organic activity. Intense activity results in bioturbation involving disruption of sediment
Tracks
Trails
Tubes
Burrows
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