Varves dating sedimentary strata
Varves dating sedimentary strata - fdating com mail ru
Biostratigraphy or paleontologic stratigraphy is based on fossil evidence in the rock layers.The basic concept in stratigraphy, called the law of superposition, states: in an undeformed stratigraphic sequence, the oldest strata occur at the base of the sequence.Chemostratigraphy studies the changes in the relative proportions of trace elements and isotopes within and between lithologic units.Catholic priest Nicholas Steno established the theoretical basis for stratigraphy when he introduced the law of superposition, the principle of original horizontality and the principle of lateral continuity in a 1669 work on the fossilization of organic remains in layers of sediment.The first practical large-scale application of stratigraphy was by William Smith in the 1790s and early 19th century.Stratigraphy is also commonly used to delineate the nature and extent of hydrocarbon-bearing reservoir rocks, seals, and traps of petroleum geology.
Chronostratigraphy is the branch of stratigraphy that places an absolute age, rather than a relative age on rock strata.
Stratigraphy is a branch of geology concerned with the study of rock layers (strata) and layering (stratification).
These variations provide a lithostratigraphy or lithologic stratigraphy of the rock unit.
Key concepts in stratigraphy involve understanding how certain geometric relationships between rock layers arise and what these geometries imply about their original depositional environment.
The branch is concerned with deriving geochronological data for rock units, both directly and inferentially, so that a sequence of time-relative events that created the rocks formation can be derived.