Umbosporites
- Citations total:
- 2
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| original | Campanian | Colorado | Newman,K.R. Upper Cretaceous-Paleocene guide palynomorphs from Northwestern Colorado. | 1965 | |
| details | Campanian | Maastrichtian | Colorado | Johnson,R.C. et al. Petrography, X-Ray mineralogy, and palynology of a measured section of the Upper Cretaceous Mesaverde Group in Hunter Canyon, Western Colorado. | 1980 |