-
Calpionellids are an
extinct group of
eukaryotic single celled organisms of
uncertain affinities.
Their fossils are
found in
marine rocks of
Upper Jur****ic...
-
Berriasian Stage.
These include calcareous microfossils, such as Nannoconus,
calpionellids, ammonites,
palynological data and magnetostratigraphy,
notably magnetozone...
- Switzerland. The base of the
Valanginian is at the
first appearance of
calpionellid species Calpionellites darderi in the
stratigraphic column. A global...
- of isotopes), that
could be used to
define or
correlate a boundary.
Calpionellids, an
enigmatic group of
planktonic protists with urn-shaped calcitic...
- of isotopes) that
could be used to
define or
correlate a boundary.
Calpionellids, an
enigmatic group of
planktonic protists with urn-shaped calcitic...
-
Lower boundary definition candidates Magnetic—base of
Chron M18r Base of
Calpionellid zone B FAD of
Ammonite Berriasella jacobi Lower boundary GSSP candidate...
-
Upper boundary definition candidates Magnetic—base of
Chron M18r Base of
Calpionellid zone B FAD of
Ammonite Berriasella jacobi Upper boundary GSSP candidate...
-
Cretaceous System) is
marked by the
first appearance of
small globular calpionellids of the
species Calpionella alpina, at the base of the
Alpina Subzone...
-
Calpionella is an
extinct genus of
calpionellid, a
group of
single celled eukaryotes.
Their fossils are
found in
rocks of
Upper Jur****ic to
Lower Cretaceous...
-
marks the
beginning of the Valanginian. It also
defines the base of the "
Calpionellid Zone E". The
species was
first described by
Colom in 1934 and is part...
