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Additional
system (geology)
English Wikipedia - The Free Encyclopedia
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System (stratigraphy)
A
system
in
stratigraphy
is a unit of
rock layers
that were laid down together within the same corresponding
geological period
. The associated period is a
chronological
time
unit
, a part of the
geological time scale
, while the system is a unit of
chronostratigraphy
. Systems are unrelated to
lithostratigraphy
, which subdivides rock layers on their
lithology
. Systems are subdivisions of
erathems
and are themselves divided into
series
and
stages
.
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