cross-stratification
Quick Summary
Cross-bedding is a type of stratification found in sedimentary rocks. It occurs when layers of sediment are deposited at an angle to the main bedding plane, creating internal cross-layers. This structure is commonly formed by moving fluids like water or wind, which transport and deposit sediment in inclined patterns.
Cross-bedding is a primary sedimentary structure, meaning it forms at the same time as the rock itself. It is particularly common in fluvial (river) and eolian (wind-blown) deposits. Geologists use cross-bedding to understand ancient current directions and depositional environments.12
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sedimentary rockBedding structureWithin the major beds, cross-bedding is common. This structure is developed by the migration of small ripples, sand waves, tidal-channel large-scale ripples, or dunes and consists of sets of beds that are inclined to the main horizontal bedding planes. Almost all sedimentary environments produce characteristic types of cross-beds; as…
Read MoreWithin the major beds, cross-bedding is common. This structure is developed by the migration of small ripples, sand waves, tidal-channel large-scale ripples, or dunes and consists of sets of beds that are inclined to the main horizontal bedding planes. Almost all sedimentary environments produce characteristic types of cross-beds; as…
Read More- sedimentary rockWackes
Sets of cross strata more than three centimetres thick are rare, but thinner sets are very common. Parallel lamination is widespread, and convolute bedding is usually present. These internal structures are arranged within wacke beds in a regular sequence. They appear to result from the action of…
Read MoreSets of cross strata more than three centimetres thick are rare, but thinner sets are very common. Parallel lamination is widespread, and convolute bedding is usually present. These internal structures are arranged within wacke beds in a regular sequence. They appear to result from the action of…
Read More