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Showing 1 to 3 of 3 for “"Stratigraphic--Precambrian"”.
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Petrography of Precambrian iron formation, Pembina County, North Dakota
… interlayered with quartz-biotite schist of Precambrian age. The core recovered from the Akra site contained mineral assemblages of the greenschist and amphibolite facies of regional metamorphism, the metamorphic grade increasing with depth. The mineral assemblages of the Hensel core indicate …
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Kaolinitic weathering zone on Precambrian basement rocks, Red River Valley, eastern North Dakota and northwestern Minnesota
… Project has provided new information on the Precambrian basement of eastern North Dakota and northwestern Minnesota. Basement rocks in this area consist of intermediate to felsic coarse-grained massive or gneissic rocks, and intermediate to mafic metavolcanic and metasedimentary schists. The …
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The geology of the Newburg-South Westhope oil fields, Bottineau County, North Dakota
… Basin are essentially one continuous secondary stratigraphic oil trap as determined by well log studies. The reservoir rocks in the two fields are carbonates present near the top of the Mississippian Ratcliffe interval and sandstone present in the basal unit of the Triassic Spearfish Formation. …