TaxNo: 5123Genus Pachydiscoceras
| Suborder: |
Paraceltitina
|
| Superfamily: |
Xenodiscoidea
|
| Family: |
Pseudotirolitidae
|
| Genus: | Pachydiscoceras |
| Qualifier: | gy |
| Author: |
Chao & Liang 1966,p.
|
| Valid: |
Pseudotirolites Sun [TAX5119] |
| Lower Boundary: |
Paratirol./Shevyrev.--Pseudosteph./Tap., 253 million years
|
| Upper Boundary: |
Pseudotir./Pleuron.--Rotodiscoceras beds, 252 million years
|