Author:
Ravn,R.L.;Witzke,B.J.
Year:
1994
Title:
The Mid-Cretacous boundary in the western interior seaway, central United States: Implications of palynostratigraphy from the type Dakota Formation. (In: Perspectives on the eastern Margin of the Cretaceous Western Interior Basin. G.W. Shurr et al, editors)
Reference:
Ravn,R.L. et al. (1994) The Mid-Cretacous boundary in the western interior seaway, central United States: Implications of palynostratigraphy from the type Dakota Formation. (In: Perspectives on the eastern Margin of the Cretaceous Western Interior Basin. G.W. Shurr et al, editors) Geological Society of America, Special Paper # 287 P. 111- 128
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Genus Species Country(Region) From To
Schizophacus Schizophacus majusculus Iowa Middle Cenomanian
Stellatopollis Stellatopollis largissimus Iowa Early Cenomanian
Stephanocolpites Stephanocolpites Nd Nd
Stephanocolpites Stephanocolpites tectorius Iowa Middle Cenomanian
Taurocusporites Taurocusporites segmentatus Iowa Late Albian Early Cenomanian
Trichodinium Trichodinium sp Iowa Middle Cenomanian
Triporoletes Triporoletes cenomanianus Iowa Middle Cenomanian
Triporoletes Triporoletes pluricellulus Iowa Middle Cenomanian
Triporoletes Triporoletes sp Iowa Middle Cenomanian
Undulatisporites Undulatisporites pannuceus Iowa Late Albian Early Cenomanian