265:, 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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