Tubulospina circinata
- Citations total:
- 3
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Author - title
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| original | Early Cenomanian | Canada(Alberta) | Singh,C. Cenomanian microfloras of the Peace River area Northwestern Alberta | 1983 | |
| details | Cenomanian | Nd | Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. | 1990 | |
| details | Vraconian | Early Cenomanian | Canada(Alberta) | Leckie,D.A. et al. An anoxic events at the Albian-Cenomanian boundary ; The Fish Scale Marker Bed, northern Alberta, Canada. | 1992 |