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Facies (Geology) -- Colorado -- Weld County
2
Fossil -- Colorado -- Weld County
2
Nannofossils -- Colorado -- Weld County
Niobrara formation
2
Petrology -- Colorado -- Weld County
2
Plankton
2
Scanning electron microscopy
2
Wattenberg field
2
biostratigraphy
2
calcareous nannofossils
2
microfossils
2
planktonic foraminifera
2
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