| system | Department | tier | Age, million years ago | |
|---|---|---|---|---|
| Paleogen | Paleocene | Danish | less | |
| a piece of chalk | Upper | Maastricht | 72.1—66.0 | |
| Campanian | 83.6—72.1 | |||
| Santonese | 86.3-83.6 | |||
| Cognac | 89.8—86.3 | |||
| Turonian | 93.9—89.8 | |||
| Cenomanian | 100.5-93.9 | |||
| Lower | Albanian | 113.0-100.5 | ||
| Aptian | 125.0-113.0 | |||
| Barremsky | 129.4-125.0 | |||
| Goterivsky | 132.9-129.4 | |||
| Valanginian | 139.8-132.9 | |||
| Berriassky | 145.0-139.8 | |||
| Yura | Top | Titan | more | |
| Division given in accordance with IUGS as of December 2016 | ||||
The Turonian layer ( Turon ) is the second lower layer of the upper section of the Cretaceous system . It includes rocks formed during the Turonian century , which lasted from 93.9 to 89.8 ± 0.3 Ma ago [1] .
Highlighted by the French paleontologist d'Orgyne in 1842 . It got its name from the historical region of Touraine (France), which the Romans called "Turonia" [2] .
In a typical locality it is composed of sandstones , marls and chalk containing abundant remains of bivalves and cephalopods , sea urchins , foraminifera and other organisms. Widely distributed in the countries of the former USSR and is represented by various types of rocks formed in marine and continental conditions [2] .
See also
- The Cenomanian-Turonian border biotic event is an anoxic event, an extinction due to a lack of oxygen, on the border of the Cenomanian and Turonian centuries.
Notes
- ↑ International Chronostratigraphic Chart (English) . International Commission on Stratigraphy (February 2017). Archived on May 15, 2017.
- ↑ 1 2 Turonian Stage - article from the Great Soviet Encyclopedia .