original |
Ypresian |
|
Maryland |
Goodman,D.K. Dinoflagellate "Communities" from the Lower Eocene Nanjemoy Formation of Maryland, USA. |
1979 |
original |
Middle Ypresian |
Late Ypresian |
Maryland |
Goodman,D.K. Dinoflagellate biostratigraphy of the Nanjemoy Formation at Popes Creek, southeastern Maryland. (In: Cretaceous and Tertiary Stratigraphy, Paleontology and Structure, Southwestern Maryland and Northeastern Virginia. N.O.Frederiksen and K.Krafft, editors) |
1984 |
original |
Ypresian |
|
Virginia |
Edwards,L.E. et al. Lower Tertiary, (Pamunkey Group), dinoflagellate biostratigraphy, Potomac River, Virginia and Maryland. (In: Cretaceous and Tertiary Stratigraphy, Paleontology and Structure, Southwestern Maryland and Northeastern Virginia. N.O.Frederiksen and K.Krafft, editors) |
1984 |