- The
Hirnantian is the
final internationally recognized stage of the
Ordovician Period of the
Paleozoic Era. It was of
short duration,
lasting about 1.4...
- The
Hirnantian glaciation, also
known as the Andean-Saharan glaciation,
Early Paleozoic Ice Age (EPIA), the
Early Paleozoic Icehouse, the Late Ordovician...
-
stage and the
start of the
Hirnantian stage. The
second pulse of
extinction occurred in the
later part of the
Hirnantian stage,
coinciding with the Metabolograptus...
- The
Hirnantian Isotopic Carbon Excursion (HICE) is a
positive carbon isotope excursion which took
place at the end of the
Ordovician period,
during the...
- the Katian, plus the
Hirnantian. The
Ashgill Epoch, the last
epoch of the
British Ordovician, is made of four ages: the
Hirnantian Age, the
Rawtheyan Age...
- it
could have
triggered the c. 1.4
million years-long Late
Ordovician (
Hirnantian)
glaciation and the
corresponding m****
extinction event (445.2 and 443...
- from the late
Ordovician (latest
Sandbien for L.
borealis to
earliest Hirnantian for L. aurora). The type species, L. aurora, was
described from remains...
- The
Steptoean positive carbon isotope excursion (****E) is a
global chemostratigraphic event which occurred during the
upper Cambrian period between 497...
- ←
Hirnantian glaciation*...
- by the
Hirnantian Stage. The
Katian began 453
million years ago and
lasted for
about 7.8
million years until the
beginning of the
Hirnantian 445.2 million...
