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Patrognathus
Patrognathus
is an
extinct
genus
of
conodonts
.
Use in
stratigraphy
The
Tournaisian
, the
oldest
age
of the
Mississippian
contains
eight
conodont
biozones, four of which
contain
Patrognathus
species:
the zone
of
Siphonodella
quadruplicata
and
Patrognathus andersoni
the
lower
zone
of
Patrognathus andersoni
the zone of
Patrognathus variabilis
the zone of
Patrognathus
crassus
