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Terreneuvian
The
Terreneuvian
is the lowermost and oldest
series
of the
Cambrian
geological
system
. Its base is defined by the
first appearance datum
of the
trace fossil
Treptichnus pedum
around million years ago. Its top is defined as the first appearance of
trilobites
in the stratigraphic record around million years ago. This series was formally ratified by the
International Commission on Stratigraphy
in 2012.
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