Relative dating sequence of events

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(dark brown) Flat lying sedimentary rocks were eventually precipitated.

The secondary rocks were thought to include interlayered basalts, which Werner thought formed by combustion of buried coal layers.

The basis for assuming that like fossils indicate contemporary formation is faunal succession.The age of formations is marked on a geologic calendar known as the geologic time scale.Development of the geologic time scale and dating of formations and rocks relies upon two fundamentally different ways of telling time: relative and absolute.These include some that establish a relative chronology in which occurrences can be placed in the correct sequence relative to one another or to some known succession of events.Radiometric dating and certain other approaches are used to provide absolute chronologies in terms of years before the present.

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