Figure 4. Chart illustrating relationship between former stratigraphic nomenclature and revised stratigraphic nomenclature as proposed in this paper for the Colville basin, northern Alaska. Stratigraphic columns in red box summarize lateral variation in previous stratigraphic nomenclature for Cretaceous strata from west to east across the western and central foothills of the Brooks Range, as presented by Chapman and others (1964). Colored columns on both sides of chart show revised stratigraphic nomenclature proposed in this paper. Colors extending across chart show correlation of newly revised nomenclature with previous nomenclature. Note that age and stratigraphic nomenclature indicated by gray have been revised; these rocks are now considered Early Cretaceous in age and assigned to the Nanushuk Formation. Quaternary units are not considered in this paper. PRINT/VIEW a high-quality PDF image

U.S. Department of the Interior, U.S. Geological Survey
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