Knowra Sedimentary facies Sedimentary facies A body of sediment or sedimentary rock distinguished by physical, chemical, or biological characteristics and interpreted as recording particular depositional conditions.
Sedimentary structure : A feature formed during sediment deposition or soon afterward, such as bedding, a ripple, or a burrow. Structures such as cross-bedding and mud cracks help distinguish facies and infer flow or exposure.
Sediment transport : The movement of sediment by fluids, gravity, or other physical processes. Transport sorts grains and shapes the deposits used to recognize facies.
Depositional environment : The physical, chemical, and biological setting in which sediment accumulates. Interpreting depositional environments is a central use of sedimentary facies.
Lithofacies : A sedimentary facies classified chiefly by observable lithology, texture, and sedimentary structures. Lithofacies isolates physical rock characteristics within the broader facies concept.
Grain size : A measure of the dimensions of particles in a sediment or sedimentary rock. Grain size records transport energy and helps distinguish coarse from fine-grained facies.
Deposition (sedimentology) : The settling or accumulation of sediment when its transporting process loses capacity or stops. Deposition creates sediment bodies whose textures and structures define facies.
Facies model : A generalized framework linking facies patterns to processes and settings in a depositional system. Models organize observed facies into predictions about environmental patterns.
Biofacies : A facies distinguished chiefly by its fossil content and interpreted biological conditions. Biofacies emphasizes fossils where biological evidence is more diagnostic than rock texture.
Sedimentary rock : Rock formed from accumulated sediment, chemical precipitates, or biological material. Facies are defined in bodies of sediment and sedimentary rock.
Diagenesis : Physical, chemical, and biological changes that transform sediment into sedimentary rock after deposition. Diagenesis can alter original facies signals or create distinctive chemical and textural features.
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