| original |
Early Gothlandian |
|
Illinois |
Collinson,C. et al. North American Paleozoic Chitinozoa |
1955 |
| details |
Early Gothlandian |
|
Nd |
Jansonius,J. Systematics of the chitinozoa. |
1966 |
| details |
Nd |
|
Nd |
Tappan,H. Chitinozoan classification. |
1966 |
| details |
Arenigian |
Llandoverian |
Nd |
Jansonius,J. Classification and stratigraphic application of chitinozoa. |
1970 |
| details |
Early Llanvirnian |
Late Llandeilian |
Nd |
Combaz,A. Stratigraphy of the chitinozoans. |
1972 |
| details |
Nd |
|
Nd |
Taugourdeau,P. Several systematic attributes proposed for chitinozoa. |
1981 |