Genus Trachysphaeridium
- Species total:
- 122
- Age range:
- 4100 - 54.5 MA (obsolete dating)
- IRMNG:
- find
Name | From | To | Age range |
---|---|---|---|
Trachysphaeridium salebrosum | Late Riphean | Late Riphean |
|
Trachysphaeridium yunnanense | Middle Proterozoic | Middle Proterozoic |
|
Trachysphaeridium granosum | Early Vendian | Early Vendian |
|