[en] Results of a reconnaissance geochemical survey of the Marquette Quadrangle, Michigan are reported. Field and laboratory data are presented for 254 groundwater and 220 stream sediment samples. Statistical and areal distributions of uranium and possible uranium-related variables are displayed. A generalized geologic map of the survey area is provided, and pertinent geologic factors which may be of significance in evaluating the potential for uranium mineralization are briefly discussed. Groundwater data indicate that the most promising area for potential uranium mineralization occurs in the west central portion of the survey area which is predominantly underlain by Precambrian granitic gneiss. Other areas which might have potential are along the south shore of Lake Superior in the Jacobsville Sandstone in the western half of the quadrangle, and in an area in the southeastern corner of the quadrangle, which is underlain by a variety of Precambrian rocks. Stream sediment data indicate that the greatest potential for uranium mineralization occurs in the western third of the Marquette Quadrangle. Stream sediments related to granite-gneiss terranes, Middle Precambrain metasediments, and major unconformities were found to have the highest anomalous uranium values. In these sediments, above-background concentrations of cobalt, chromium, iron, lithium, nickel, and manganese appear to be associated with anomalously high concentrations of soluble uranium