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Geolocation
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Author - title
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Year
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| details | Ludlovian | Spain | Cramer,F.H. Microplankton from three Palaeozoic formations in the Province of Leon, northwest Spain. | 1964 | |
| details | Wenlockian | England(Shropshire) | Downie,C. 'Hystrichosheres', (acritarchs), and spores of the Wenlock Shales, (Silurian), of Wenlock, England. | 1963 | |
| details | Late Llandoverian | Baltic | Downie,C. et al. On the interpretation and status of some Hystrichosphere genera. | 1963 |