Genus Trachysphaeridium
- Species total:
- 122
- Age range:
- 4100 - 54.5 MA (obsolete dating)
- IRMNG:
- find
Name | From | To | Age range |
---|---|---|---|
Trachysphaeridium adischevii | Early Cambrian | Early Cambrian |
|
Trachysphaeridium acis | Middle Proterozoic | Middle Proterozoic |
|
Trachysphaeridium | Precambriam | Permian |
|