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Author - title
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Year
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| details | Early Asbian | England(Durham) | Johnson,G.A.L. et al. Carboniferous biostratigraphy of the Rookhope Borehole, County Durham. | 1996 | |
| details | Asbian | England(Northumberland) | Gueinn,K.J. Miospore assemblages. (In: Geology of the Country around Bellingham: Memoir for 1 to 50,000 Geological Sheet 13: D.V.Frost and D.W.Holliday, editors) | 1980 |