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Geolocation
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Author - title
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Year
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| details | Middle Cambrian | Early Tremadocian | Poland | Kowalczewski,Z. et al. New data on Cambrian and Lower Ordovician rocks in the vicinity of Wisniowka in the Gory Swieto Krzyskie Mountains. | 1986 |
| details | Middle Cambrian | Nd | Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. | 1990 |