Genus Tetrad

Species total:
30
Age range:
2600 - 1.8 MA (obsolete dating)
IRMNG:
find
Name From To Age range
Tetrad spore type 1,Saxe.& Rao,1996 Early Miocene Early Miocene
Tetrad tetrahedral Early Eocene Middle Eocene
Tetrad type 1 Wenlockian Middle Cenomanian
Tetrad type 2 Wenlockian Gedinnian
Tetrad type 3 Late Ordovician Late Ordovician
Tetrad type 39 Early Triassic Jurassic
Tetrad type A Late Ordovician Late Ordovician
Tetrad type A Vavr.,1984 Ashgillian Ashgillian
Tetrad type B Late Telychian Early Sheinwoodian
Tetrad type C Vavr.,1984 Late Ordovician Late Ordovician
Tetrad type F Late Ordovician Late Ordovician
Tetrad type xxx Miocene Late Neogene
Tetrad type xxxi Miocene Late Neogene