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Geolocation
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Author - title
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Year
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| details | Late Arenigian | Bulgaria | Kalvacheva,R.K. Palynology and stratigraphy of the Diavase-Phyllitoid complex in the West Balkan Mountains. | 1982 | |
| details | Early Tremadocian | Early Ludlovian | Belgium | Martin,F. The acritarchs from the Belgian Ordovician and Silurian. Determination and stratigraphic value. | 1968 |