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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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| original | Late Cretaceous | Colorado | Clarke,R.T. Palynology of Vermejo Formation Coals, (Upper Cretaceous) in the Canon City Coal Field, Fremont County, Colorado | 1963 | |
| original | Early Tertiary | Canada(British Columbia) | Boneham,R.F. Palynology of three Tertiary Coal Basins in South-Central British Columbia | 1968 |