System (period) | Series (epoch) | Stage (age) | Lower boundary, Ma | |
---|---|---|---|---|
Paleogene | Paleocene | Danian | 66,0 | |
Cretaceous | Upper (Late) | Maastrichtian | 72.1±0.2 | |
Campanian | 83.6±0.2 | |||
Santonian | 86.3±0.5 | |||
Coniacian | 89.8±0.3 | |||
Turonian | 93.9 | |||
Cenomanian | 100.5 | |||
Lower (Early) | Albian | ~113.0 | ||
Aptian | ~121.4 | |||
Barremian | 125.77* | |||
Hauterivian | ~132.6 | |||
Valanginian | ~139.8 | |||
Berriasian | ~145.0 | |||
Jurassic | Upper | Tithonian | older | |
Subdivisions and "golden spikes" according to IUGS as of September 2023[1] *A golden spike is seen in chart but not ratified yet. |
The Hauterivian is a third stage of the Lower Cretaceous series, corresponding to the Hauterivian age of the Early Cretaceous epoch. It lasted from approximately 132.6 Ma to around 125.77 Ma (million years ago). It is preceded by the Valanginian age and is followed by the Barremian age.
Definition[]
The GSSP of the Hauterivian stage was ratified in 2019. The lower boundary is fixed in the base of Bed 189 of La Charce Section, France, and related to the first appearance of the ammonite genus Acanthodiscus.[2]
Hauterivian life[]
Ammonites including Bochianites, Endemoceras, Simbirskites, Pseudothurmannia and Speetoniceras as well as belemnites like Belemnopsis were common in Hauterivian seas. Ophthalmosaurid ichthyosaurs like Platypterygius hunted fish such as Gyrodus in deep waters. Abyssosaurus, a cryptoclidid, was found in the Hauterivian strata of Chuvash, Russia. In Hauterivian age, pliosaurids were still common in the seas. Makhaira was the apex predator while Luskhan likely hunted small animals due to its narrow and graceful snout.
Turtles (Sinemys, Ordosemys), choristoderes (Ikechosaurus) and crocodylomorphs (Shantungosuchus) lived in Hauterivian rivers. Herbivorous ornithopods Valdosaurus grazed on the floodplains, and theropods like Eotyrannus hunted them. Eastern Psittacosaurus was an early ceratopsian, although it doesn't have prominent horns and frill, unlike its future descendants. Birds like Ambiortus were gradually spreading across the planet.
References[]
- ↑ "Latest version of international chronostratigraphic chart". International Commission on Stratigraphy. https://stratigraphy.org/chart#latest-version.
- ↑ "GSSP Table - Mesozoic Era". https://timescalefoundation.org/gssp/index.php?parentid=35.