![]() The sequence stratigraphic approach recommended on this web site for the interpretation of sedimentary rocks contrasts with: These properties in turn can be used to explain how the mechanisms of sediment accumulation, erosion and inter-related processes produced the current configuration of these rocks. ![]() Thus the sequence stratigraphic framework is used to analyze and explain how sedimentary rocks acquire their layered character, lithology, texture, faunal associations and other properties. The advantage of the strategy is it considers new questions, leading to more realistic interpretations and enhanced predictions of lithofacies heterogeneity's. A limit to this analytical strategy is often the extent of ones understanding of the inferred depositional setting. These include:Īs these sediments are reassembled, the genetic character of the sequences, systems tracts, parasequences, and beds will be seen as products of changes in accommodation. The back-stripping and analysis is aided by a variety of contemporaneous elements subdivided by the surfaces and their hierarchy from low frequency to high frequency. In contrast, a drop in sea level may cause the shore and the near-shore to be eroded, forming sequence boundaries (SB). The result is that from the Phanerozoic on the sediments have a strong radioactive signal on gamma logs with matching condensed section s of fossils that accumulated on a surface or in a thin zone which is known as the maximum flooding surface (mfs). These organics sequestered radioactive elements in the water column. When the rate of sea level rise reached its most rapid change, the rate of sediment accumulating seaward of the shore slowed while from the onset of the Phanerozoic the pelagic and benthic organic matter continued to accumulate. This would have resulted in transgression s that caused the shore and the near-shore being flooded so transgressive surface s (TS) formed. From the moment the oceans were first generated, their water volume and distribution across the globe has varied. These surfaces are commonly generated by the changes in relative sea level. The key to using sequence stratigraphy as a tool for interpreting the sedimentary section are the major bounding and subdividing surfaces (see the banner image above). ![]() In the hope of circumnavigating this, the site places a heavy dependence on the explanation of terminology linked pop-up boxes whose contents is intended to clarify the understanding and use of this discipline of stratigraphy.īounding Surfaces of Sequence Stratigraphy Terminology often involves conceptual depositional models, sea level, and/or age duration, mixing interpretation with observation, applying different genetic names to the same surfaces or deposits that depend on the model employed. The major problem with sequence stratigraphy is that the definition, terminology and interpretation of the surfaces of sequence stratigraphy is complex and often contentious (Neal & Abrue, 2009).
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