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s of stratigraphic sections measured at seven localities, and the available analytical data, are presented in the following pages. Their locations, as well as the locations of sections reported previously (McKelvey and others, 1953a and b, and O'Malley and others, 1953) and of others to be reported later, are shown in f:igure 1. The semiqw;mtitative spectrographic analyses are based upon comparisons with a standard plate representing known quantities of the elements tested for and made at the same exposure. Greater sensitivities for many elements can be obtained by additional exposures. The standard sensitivities for the elements noted in this report are listed below: .Spectrographic sensitivities

Stratigraphic sections of the Phosphoria formation in Idaho, Montana, Utah and Wyoming