Correlation chart of Cretaceous and Paleocene rocks of the northern Great Plains
Chart showing geologic stratigraphy of American states and Canadian provinces on the Great Plains. Shows layers by series and stage ; used to show potential oil producing layers in the region.
"Chart showing geologic stratigraphy of American states and Canadian provinces on the Great Plains. Shows layers by series and stage ; used to show potential oil producing layers in the region."@en
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