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From
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To
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Geolocation
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Author - title
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Year
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| details | Eifelian | Givetian | Scotland(Orkney) | Mortimer,M.G. Some Lower Devonian microfloras from Southern Britain. | 1967 |
| details | Frasnian | Canada(NWT,Franklin) | McGregor,D.C. et al. Devonian spores of eastern and northern Canada. | 1966 | |
| original | Eifelian | Givetian | Scotland(Orkney) | Richardson,J.B. Middle Old Red Sandstone spore assemblages from the Orcadian Basin, northeast Scotland. | 1965 |