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A preliminary polarity zonation has been obtained from drill core and surface sections of the upper Fort Union Formation (Paleocene) and lower Wasatch Formation (Eocene) in the northern Powder River Basin of Wyoming and Montana. The polarity data support surface and subsurface strati graphic correlations of coal beds in the Fort Union Formation. Strati graphic correlations proposed for some coal beds in the Wasatch Formation, however, are not supported by the polarity data. The Truman-Parnel1 (Ulm2) coal bed in the Recluse, Wyoming, area is in a zone of reversed polarity, whereas the Healy coal bed (Ulm 2) of the Buffalo area lies within an interval of normal polarity and appears distinctly younger. Preliminary correlation with the polarity time scale suggests that 1) sections of the Fort Union and Wasatch Formations studied were deposited from about 62 to 52 m.y. ago, 2) the strata accumulated at a rate of about 55 m/m.y. , and 3) the Fort Union-Wasatch contact lies close to the Pal eocene-Eocene boundary.

u.s. geological survey open file report/open-file report

Preliminary magnetostratigraphic correlations in upper Fort Union Formation (Paleocene) and lower Wasatch Formation (Eocene), northern Powder River basin, Wyoming and Montana