Genus Tetrad

Species total:
30
Age range:
2600 - 1.8 MA (obsolete dating)
IRMNG:
find
Name From To Age range
Tetrad Late Precambrian Oligocene
Tetrad forma 12 Albian Turonian
Tetrad planar Late Cretaceous Middle Paleocene
Tetrad small Paleocene Early Eocene
Tetrad sp Proterozoic Hauterivian
Tetrad sp. Stee.et al,2000 Nd Nd
Tetrad sp. Vavr.,1984 Late Ordovician Late Ordovician
Tetrad sp.1 Emsian Emsian
Tetrad sp.1 Rubi.& Stee.,2002 Late Ludlovian Early Pridolian
Tetrad sp.2 Emsian Emsian
Tetrad sp.3 Emsian Emsian
Tetrad sp.3350 Magl.,1967 Middle Llandoverian Lochkovian
Tetrad sp.A Manu.et al,1989 Miocene Miocene
Tetrad sp.B Wenlockian Gedinnian
Tetrad sp.B Manu.et al,1989 Miocene Miocene
Tetrad sp.C Wenlockian Gedinnian
Tetrad sp.D Pridolian Gedinnian