Late Cretaceous (Campanian) organic-walled microplankton from the interior plains of Canada, Wyoming and Texas; biostratigraphy, palaeotology and palaeoenvironmental interpretation.
Reference:
Harker,S.D. et al. (1990)
Late Cretaceous (Campanian) organic-walled microplankton from the interior plains of Canada, Wyoming and Texas; biostratigraphy, palaeotology and palaeoenvironmental interpretation. Pal¤eontographica Abteilung B
Vol. 219 # 1 P. 1- 243