Name | From | To | Age range |
---|---|---|---|
Tetrad type 1 | Wenlockian | Middle Cenomanian |
|
Tetrad sp.B | Wenlockian | Gedinnian |
|
Tetrad sp.C | Wenlockian | Gedinnian |
|
Tetrad type B | Late Telychian | Early Sheinwoodian |
|
Tetrad sp.3350 Magl.,1967 | Middle Llandoverian | Lochkovian |
|
Tetrad type A Vavr.,1984 | Ashgillian | Ashgillian |
|
Tetrad type C Vavr.,1984 | Late Ordovician | Late Ordovician |
|
Tetrad type F | Late Ordovician | Late Ordovician |
|
Tetrad sp. Vavr.,1984 | Late Ordovician | Late Ordovician |
|
Tetrad type A | Late Ordovician | Late Ordovician |
|
Tetrad type 3 | Late Ordovician | Late Ordovician |
|
Tetrad | Late Precambrian | Oligocene |
|
Tetrad sp | Proterozoic | Hauterivian |
|