| details |
Late Ordovician |
|
Indiana |
Sarjeant,W.A.S. et al. The Micrhystridium and Veryhachium Complexes (Acritarcha: Acanthomorphitae and Polygonomorphitae): A taxonomic reconsideration. |
1994 |
| details |
Late Ordovician |
|
Indiana |
Stancliffe,R.P.W. et al. The acritarch genus Dorsennidium, Wicander, 1974, emend.Sarjeant and Stancliffe,1994: A reassessment of its constituent species |
1996 |
| details |
Richmondian |
|
Missouri |
Wicander,R. et al. Taxonomic, biostratigraphic, and paleogeographic implications of an Upper Ordovician acritarch assemblage from the Maquoketa Shale, Northeastern Missouri, U.S.A. |
1998 |
| details |
Richmondian |
|
Missouri |
Wicander,R. et al. Stratigraphy and paleogeographic significance of an Upper Ordovician acritarch flora from the Maquoketa Shale, Northeastern Missouri, USA |
1999 |