254:, etc.) of differing rock types that were being laid down in different environments at the same time. In the same way, a lithostratigraphic unit can include a number of systems or parts of them.
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Series is a term defining a unit of rock layers formed during a certain interval of time (a chronostratigraphic unit); it is equivalent (but not synonymous) to the term
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subdivided into series. Some of these have their own names, in other cases a system is simply divided into a Lower, Middle and Upper series. The
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Systems can include many lithostratigraphic units (for example
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subdivision of an age, not used by the ICS timescale
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283:Cohen, K.M.; Finney, S.; Gibbard, P.L. (2015),
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214:had not yet named all four series of the
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286:International Chronostratigraphic Chart
63:Units in geochronology and stratigraphy
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210:series. In 2008, the
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69:Segments of rock (
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196:Cretaceous
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258:See also
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192:eonothem
93:Eonothem
85:Notes to
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108:Erathem
36:systems
232:Tonian
138:Series
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40:stages
20:Series
290:(PDF)
173:Chron
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98:Eon
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