The GTS is divided into chronostratigraphic units and their corresponding geochronologic units. See also: Stratigraphy, Chronostratigraphy, Biostratigraphy, Magnetostratigraphy, Lithostratigraphy, and Geochronology Relationships of unconformities – Geologic features representing periods of erosion or non-deposition, indicating non-continuous sediment deposition.Inclusion – Small fragments of one type of rock but embedded in a second type of rock must have formed first, and were included when the second rock was forming.Cross-cutting relationships – A rock feature that cuts across another feature must be younger than the rock it cuts.This allows for correlation of stratum even when the horizon between them is not continuous. Biologic succession (where applicable) – This states that each stratum in a succession contains a distinctive set of fossils.
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