Aeromagnetic, Bouguer gravity, and generalized geologic studies of the Great Falls-Mission Range area, northwestern Montana

Geological Survey research 1980

“…In addition, a preliminary gravity map of the Choteau 2° quadrangle shows further definition of northeasterly trends parallel to the Scapegoat-Bannatyne trend (Kleinkopf and Mudge, 1972) and suggests additional similar trends to the north. These trends may indicate discontinuities in the crystalline basement such as fracture zones or warping that may have influenced sedimentation patterns and the potential for hydrocarbon accumulation.…”

Detailed study of selenium in soil, water, bottom sediment, and biota in the Sun River Irrigation Project, Freezout Lake Wildlife Management Area, and Benton Lake National Wildlife Refuge, west-central Montana, 1990-92

“…In the western half of the study area, geologic information is available only from smaller-scale, regional maps (Mudge and others, 1982;Kleinkopf and Mudge, 1972). Colton and others (1961) mapped the extent of the last Pleistocene continental ice sheet and glacial Lake Great Falls.…”

“…These deposits consist of unconsolidated fluvial silt, sand, and gravel and include alluvialfan and slope-wash deposits. Geology modified from Mudge and others (1982), Maughn (1961), Lemke (1977), Kleinkopf and Mudge (1972), and Maughn and Lemke (1991) …”

Map showing mineral resource assessment for vein and replacement deposits of gold, silver, copper, lead, zinc, manganese, and tungsten in the Butte 1° x 2° quadrangle, Montana

“…The resulting anomaly data were compared with data from 11 smaller surveys covering parts of the quadrangle (Johnson and others, 1965;U.S. Geological Survey, 1966, 1980a, 1980bMudge and others, 1968;Kleinkopf and Mudge, 1972;Douglas, 1973;Hanna, 1978;Lidke and others, 1983;Madson and others, 1983), many of which had been shown (Hassemer and Hanna, 1982) to exhibit inconsistencies relative to one another. This comparison of data sets served to verify the existence and locations of several important anomalies.…”