Diachronism

megalodon

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Diachronism is a sedimentary cycle that deposits the same type of rock over time and space, resulting in different geological age in places away from each other in the same group of rocks. The basic principle of diachronism is that rock bodies "cross ages" which is nothing more than saying "it has a different age depending on the location" or "the sequence is younger towards the south."

The definition of diachronism has also been applied to other forms of phenomena, such as igneous phenomena, tectonics, erosion surfaces, areas of uplift etc. The usage of the term is as follows "volcanism is diachronic towards the east," i.e., the age of eruptions is younger towards the east, or "The furrow axis advances diachronically towards the south," i.e., the age of the furrow sediments is younger in the samples as they come from increasingly southerly locations. It is also applied to fossils which appear sporadically at different times in different places due to migration. However, some authors consider the usage of the term to fossils as an extrapolation.
 

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