| broader |
|
| change note |
2019-10-09 07:13:31.0 [tstevens] Insert Concept
add broader relation (MAASTRICHTIAN [8ce20eea-74f0-40cd-b611-4686427c5fa4,369249]
- UPPER [d3928482-e056-4d2d-ae5a-1e7097099c2b,369237]);
|
|
2019-10-09 09:58:19.0 [tstevens]
insert Definition (id: null
text: The Maastrichtian is, in the ICS geologic timescale, the latest age (uppermost
stage) of the Late Cretaceous epoch or Upper Cretaceous series, the Cretaceous period
or system, and of the Mesozoic era or erathem. It spanned the interval from 72.1 to
66 million years ago. The Maastrichtian was preceded by the Campanian and succeeded
by the Danian (part of the Paleogene and Paleocene).
At the end of this period, there was a mass extinction known as the Cretaceous–Paleogene
extinction event (formerly known as the Cretaceous–Tertiary extinction event).[a]
In this extinction event, many commonly recognized groups such as non-avian dinosaurs,
plesiosaurs and mosasaurs, as well as many other lesser-known groups, died out. The
cause of the extinction is most commonly linked to an asteroid about 10 to 15 kilometres
(6.2 to 9.3 mi) wide colliding with Earth at the end of the Cretaceous.
language code: en);
|
|
|
| definition |
The Maastrichtian is, in the ICS geologic timescale, the latest age (uppermost stage)
of the Late Cretaceous epoch or Upper Cretaceous series, the Cretaceous period or
system, and of the Mesozoic era or erathem. It spanned the interval from 72.1 to 66
million years ago. The Maastrichtian was preceded by the Campanian and succeeded by
the Danian (part of the Paleogene and Paleocene).
At the end of this period, there was a mass extinction known as the Cretaceous–Paleogene
extinction event (formerly known as the Cretaceous–Tertiary extinction event).[a]
In this extinction event, many commonly recognized groups such as non-avian dinosaurs,
plesiosaurs and mosasaurs, as well as many other lesser-known groups, died out. The
cause of the extinction is most commonly linked to an asteroid about 10 to 15 kilometres
(6.2 to 9.3 mi) wide colliding with Earth at the end of the Cretaceous.
|
|
| type |
|
| in scheme |
chronounits original |
|