-
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...
- markers,
especially Nannoconus steinmannii minor, N.
kamptneri minor, and
Calpionella alpina,
within precisely fixed magnetozones give
greater precision in...
- the Jur****ic–Cretaceous boundary. In particular, the
first appearance Calpionella alpina,
coinciding with the base of the
eponymous Alpina subzone, has...
- the Jur****ic–Cretaceous
boundary In particular, the
first appearance Calpionella alpina, co-inciding with the base of the
eponymous Alpina subzone, has...
- distribution,
several other candidates that have been nominated,
including Calpionella alpina. "Mindat.org". www.mindat.org.
Retrieved 2022-11-11. https://biblio...
- lorica.
Calpionellidae appear later,
including widespread genera such as
Calpionella and Calpionellites, and have
combined microgranular and
hyaline lorica...
-
Guasasa Formation, Cuba Lake Rożnów,
Poland Lapos Formation,
Romania Miravetes and
Tollo Formations,
Spain Calpionella Calpionellites at Fossilworks.org...
- the
first appearance of
small globular calpionellids of the
species Calpionella alpina, at the base of the
Alpina Subzone . The
Tithonian is
often subdivided...
-
however since 2016 this had been
replaced by the
first occurrence of
Calpionella alpina. Some
authors regard B.
jacobi as
instead belonging to the genus...
