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Geolocation
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Author - title
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Year
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| original | Middle Cambrian | Tremadocian | Spain | Fombella,M.A. Acritarchs of the Oville Formation, Middle Cambrian-Tremadocian age, Province of Leon, Spain. | 1978 |
| details | Middle Cambrian | Early Tremadocian | Spain | Fombella,M.A. Palynology of the Oville Formation, north and south Cantabrian Mountains. | 1978 |