- zone of
Guembelites jandi**** The
Norian is
divided into
three global subages or substages:
Lacian (lower Norian)
Alaunian (middle Norian)
Sevatian (upper...
- the late Aritan. The
Barremian is
often subdivided into two
substages or
subages, Lower/Early and Upper/Late Barremian. In the
Tethys domain, the Barremian...
- into the
Griesbachian and
Dienerian subages and the
Olenekian is
subdivided into the
Smithian and
Spathian subages. The
Lower Tri****ic
series is coeval...
- appears. The
Campanian can be
subdivided into Lower,
Middle and
Upper Subages. In the
western interior of the
United States, the base of the
Middle Campanian...
- The
Olenekian is
sometimes divided into the
Smithian and the
Spathian subages or substages. The
Olenekian follows the
Induan and is
followed by the Anisian...
- The
Albian is
sometimes subdivided in Early/Lower,
Middle and Late/Upper
subages or substages. In
western Europe,
especially in the
United Kingdom, a subdivision...
- are
arranged in a hierarchy: eon, era, period, epoch, subepoch, age, and
subage.
Geochronology is the
scientific branch of
geology that aims to determine...
-
sometimes subdivided in Lower/Early,
Middle and Upper/Late
substages or
subages. In the
Tethys domain, it
contains the
following ammonite biozones: zone...
-
Deshayesites oglanlensis Sometimes the
Aptian is
subdivided in
three substages or
subages:
Bedoulian (early or lower),
Gargasian (middle) and
Clansayesian (late...
- The
Induan is
sometimes divided into the
Griesbachian and the
Dienerian subages or substages. The
Induan is
preceded by the
Changhsingian (latest Permian)...
