...D. B. Stewart Abstract Narsarsukite, Na 2 TiSi 4 O 11 , is described from the second of three localities in the Sweetgrass Hills, Montana. Narsarsukite is associated with manganpectolite, quartz, calcite, and galena in veins cutting an orthoclase-albite-aegirine-quartz hybrid rock in a zone...

...James O. G. Sanderson ABSTRACT The nearest exposure to the plains of southern Alberta of the marine Jurassic Ellis formation is in the Sweetgrass Hills, a few miles south of the Alberta-Montana boundary. Here it is a dark shale series containing medium-grained sandstone beds, a limestone zone, some...

... eastward to 200 feet in the Sweetgrass Hills and westward to about 200 feet along the Rocky Mountain Front. The formation is absent over most of the South arch. The lower two members pass into redbeds east of the Sweetgrass Hills and on the southeast flank of the South arch. The Rierdon formation consists...

.... Two areas are discussed, the Williston basin in northeastern Montana and the Sweetgrass Hills province in northwestern Montana. A sequence of prolific pre-Mississippian Paleozoic discoveries in northwestern Montana since 1960 had earlier revived interest in this area. During 1962, exploration...

... been integrated. The present foraminiferal biostratigraphic study includes a 38 000 km 2 area straddling the Alberta–Montana border from the Lewis thrust in the west to the Sweetgrass Hills in the east, including the Sweetgrass Arch.Stratigraphic cross sections and isopach maps of six Albian – early...

...R. W. C. Arnott; F. J. Hein; S. G. Pemberton Abstract In north-central Montana the Bootlegger Member of the upper Lower Cretaceous Blackleaf Formation is well exposed near Great Falls and at one locality in the Sweetgrass Hills. In both areas, Bootlegger strata comprise four stratigraphic...

...: the South arch, which culminates in the Beltian exposures on the south end; the Kevin-Sunburst dome and the Sweetgrass Hills which dominate the center along the International Boundary; and the Bow Island arch which plunges northward into southern Alberta. Early exploration for hydrocarbons naturally...

... of the Rocky Mountains during Laramide orogenesis and later shed farther into the basin during rebound due to unloading of the Laramide thrusts by erosion. Most recent transport resulted from uplift by intrusive activity of the Sweetgrass Hills, the Bearpaw Mountains, and the Highwood Mountains in northern...

...Fig. 4. Outcrops along Deer Creek, East Butte, Sweetgrass Hills, Montana. Left sedimentological column shows the type section of the Ferdig Member in northern Montana ( Cobban et al., 1976 ). Middle column is the reference section of the Carlile Formation in the Sweetgrass Hills, northern...

...Irvin Kranzler ABSTRACT Exploration activity in Montana produced significant results in five widely separated areas: (1) Northwestern Montana (Sweetgrass Hills area)—Oil was discovered in the Cretaceous Sunburst Sandstone in the old Fred and George Creek—Arch Apex gas field area. Also significant...

... reading and criticism of the manuscript. To Wm. T. Nightingale 2 the writer is grateful for many helpful suggestions in regard to the structure of the Sweetgrass Hills area. To V. J. Hendrickson, of the Texas Production Company, and F. C. Platt, Northern Oil Information Bureau, the writer is indebted...