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Additional
Ptychagnostus atavus
English Wikipedia - The Free Encyclopedia
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Ptychagnostus atavus
Ptychagnostus atavus
is a
species
of
agnostid
trilobite
. It belongs to the genus
Ptychagnostus
in the
family
Ptychagnostidae
. It was originally described by
Swedish
paleontologist
as
Agnostus atavus
in 1880. It is used in
biostratigraphy
as an
index fossil
. Its
first appearance
at the
GSSP
section in the
Wheeler Shale
of
Utah
is defined as the beginning of the
Drumian
Age
(around
million years ago
) of the
Cambrian Series 3
(
Middle Cambrian
).
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