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Author - title
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Year
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| details | Nd | Nd | Ravn,R.L. Palynostratigraphy of the Lower and Middle Pennsylvanian Coals of Iowa | 1986 | |
| details | Nd | Nd | Medvedeva,A.M. Palynological investigation of Petroleum | 1978 | |
| details | Nd | Nd | Smith,A.H.V. Verrucosisporites (Ibr.) emend. | 1963 | |
| details | Emsian | France(Bretagne) | Moreau-Benoit,A. Palynological and planktonic research on the Devonian and some Silurian formations of the southeast Massif Armoricain. | 1974 |