| link
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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 | Caradocian | Algeria | Deunff,J. et al. Palynoplanktonic correlation in the Cambro-Ordovician of the Sahara | 1961 | |
| details | Silurian | Baltic | Collinson,C. et al. North American Paleozoic Chitinozoa | 1955 | |
| details | Llanvirnian | Poland | Bednarczyk,W.S. Chitinozoa-bearing horizons in the Ordovician of Northern Poland in the light of conodont stratigraphy. | 1999 | |
| details | Late Arenigian | England(Cumberland) | Arthurton,R.S. et al. Ordovician and Silurian. (In: Geology of the Country around Penrith.) | 1981 |