-
Calpionellids are an
extinct group of
eukaryotic single celled organisms of
uncertain affinities.
Their fossils are
found in
marine rocks of
Upper Jur****ic...
- 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...
-
Berriasian Stage.
These include calcareous microfossils, such as Nannoconus,
calpionellids, ammonites,
palynological data and magnetostratigraphy,
notably magnetozone...
- of minerals.
Fossils resembling tintinnid loricas in
shape and size,
Calpionellids,
appear as
early as the
Ordovician period but are
formed of calcite...
-
Lower boundary definition candidates Magnetic—base of
Chron M18r Base of
Calpionellid zone B FAD of
Ammonite Berriasella jacobi Lower boundary GSSP candidate...
- coccolithop****s,
calcareous nannoplankton and algae, ostracodes, pteropods,
calpionellids and bryozoa The
study of
microfossils is
called micropaleontology....
-
Upper boundary definition candidates Magnetic—base of
Chron M18r Base of
Calpionellid zone B FAD of
Ammonite Berriasella jacobi Upper boundary GSSP candidate...
- Switzerland. The base of the
Valanginian is at the
first appearance of
calpionellid species Calpionellites darderi in the
stratigraphic column. A global...
-
Cretaceous System) is
marked by the
first appearance of
small globular calpionellids of the
species Calpionella alpina, at the base of the
Alpina Subzone...
