| original |
Early Campanian |
|
Alaska(North Slope) |
Wiggins,V.D. Expressipollis striatus, n.sp., to Anacolosidites striatus, n.sp., an Upper Cretaceous example of suggested pollen aperture evolution. |
1982 |
| details |
Campanian |
|
Nd |
Muller,J. Significance of fossil pollen for angiosperm history. (In: Historical Perspectives of Angiosperm Evolution.) |
1984 |
| details |
Campanian |
Maastrichtian |
Alaska |
Frederiksen,N.O. Reconnaissance biostratigraphy of the Expressipollis and oculata pollen groups in Campanian and Maastrichtian rocks of the North Slope, Alaska |
1986 |