- 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 Late
Ordovician glaciation, the end-Ordovician glaciation, or the
Hirnantian glaciation,
occurred during the
Paleozoic from
approximately 460 Ma to...
-
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 Katian, plus the
Hirnantian. The
British ages (subdivisions of epochs) from
youngest to
oldest are: "Late Ordovician"
Hirnantian/Gamach (Ashgill) Rawtheyan/Richmond...
- 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...
-
specifically to the only
extant family, Limulidae). They
first appeared in the
Hirnantian (Late Ordovician). Currently,
there are only four
living species. Xiphosura...
- 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...
- The
Steptoean positive carbon isotope excursion (****E) is a
global chemostratigraphic event which occurred during the
upper Cambrian period betwee 497...
-
million year cool period, the
Early Palaeozoic Icehouse,
culminating in the
Hirnantian glaciation, 445 million
years ago at the end of the Ordovician. The middle...
- S2CID 132643646. Karolína Lajblová; Petr
Kraft (2018). "Middle Katian/lowermost
Hirnantian ostracods from the
Prague Basin (Czech Republic):
Diversity responses...
