- Author:
- Gray,J.
- Year:
- 1988
- Title:
- Land plant spores and Ordovician-Silurian boundary. (In: A Global Analysis of the Ordovician-Silurian Boundary. L.R.M.Cocks and R.B.Rickards, editors)
- Reference:
- Gray,J. (1988) Land plant spores and Ordovician-Silurian boundary. (In: A Global Analysis of the Ordovician-Silurian Boundary. L.R.M.Cocks and R.B.Rickards, editors) British Museum (Natural History) Geology, Bulletin Vol. 43 P. 351- 358
- Google Academy:
- try to search by title in english
| Genus | Species | Country(Region) | From | To |
|---|---|---|---|---|
| Dactylofusa | Dactylofusa maranhensis | Brazil(Amazonas) | Middle Llandoverian | |
| Tetrahedraletes | Tetrahedraletes medinensis | North America | Ashgillian | Middle Llandoverian |
| Tetrahedraletes | Tetrahedraletes medinensis | Sweden(Gotland) | Ordovician | Early Silurian |
| Tetrahedraletes | Tetrahedraletes medinensis | USA(Appalachian Bn.) | Ashgillian | Late Llandoverian |
| Veryhachium | Veryhachium carminae | Brazil(Amazonas) | Middle Llandoverian |