- Author:
- Smith,P.L.;Beyers,J.M.;Carter,E.S.;Jakobs,G.K.;Paley,J.;Pessagno,E.;Tipper,H.W.
- Year:
- 1994
- Title:
- North America
- Reference:
- Smith,P.L. et al. (1994) North America Newsletters on Stratigraphy Vol. 31 # 1 P. 33- 70
- Google Academy:
- try to search by title in english
| Genus | Species | Country(Region) | From | To |
|---|---|---|---|---|
| Dictyotidium | Dictyotidium eastendense | North America | Early Sinemurian | Toarcian |
| Leiosphaeridia | Leiosphaeridia tangentensis | North America | Early Sinemurian | |
| Micrhystridium | Micrhystridium polyedricum | North America | Early Sinemurian |