Microfossil of the oil shale of the Green River formation: Trilobate spinose pollen grain. Colorado or Utah. 1925.
Dates
Date Taken
1925
Summary
Microfossil of the oil shale of the Green River formation: Trilobate spinose pollen grain. Colorado or Utah. 1925. Plate 25, figure 3, U.S. Geological Survey. Professional paper 168. 1931.
Summary
Microfossil of the oil shale of the Green River formation: Trilobate spinose pollen grain. Colorado or Utah. 1925. Plate 25, figure 3, U.S. Geological Survey. Professional paper 168. 1931.
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