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Cross-Section of Paleozoic Rocks of Western North Dakota

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Cross-Section of Paleozoic Rocks of Western North Dakota JolfN P. BLOEMLE N. D. Geological Survey NORTH DAKOTA GEOLOGICAL SURVEY WILSON M. LAIRD, State Geologist Miscel1aneous Series No. 34 CROSS-SECTION OF PALEOZOIC ROCKS OF WESTERN NORTH DAKOTA BY CLARENCE G. CARLSON Reprinted from Stratigraphic Cross Section of Paleozoic Rocks-Oklahoma to Saskatchewan, 1967: The American Association of Petroleum Geologists Cross Section Publication 5, p. 13-15, 1 Plate Grand Forks, North Dakota, 1967 NORTH DAKOTAI (Section E-F. Plate 5) C. G. CARLSON' Grand Forks, North Dakota INTRODUCTION which, in ascending order, are the Black Island, Icebox, The North Dakota segment of the cross section was and Roughlock. The Black Island generally consists of constructed with the base of the Spearfish Formation as clean quartzose sandstone, the Icebox of greenish-gray, noncalcareous shale, and the Roughlock of greenish-gray the datum. However, the Permian-Triassic boundary to brownish-gray, calcareous shale or siltstone. now is thought to be within redbeds of the Spearfish The Black Island and Icebox Formations can be Formation (Dow, 1964). If this interpretation is cor­ traced northward to Saskatchewan, but they have not rect, perhaps as much as 300 ft of Paleozoic rocks in been recognized as formations there and are included in well 3 and smaller thicknesses in wells I, 2, and 4-12 an undivided Winnipeg Formation. The Black Island are excluded from Plate 5. pinches out southwestward because of nondeposition Wells were selected which best illustrate the Paleozo­ along the Cedar Creek anticline, but the Icebox and ic section and its facies changes in the deeper part of Roughlock Formations, although not present on the the Williston basin. They include the deepest well in cross section because they were not penetrated by the North Dakota (well 8), but the scarcity of wells reach­ selected wells, extend southward into South Dakota, ing the Precambrian in the area of the cross section ne­ where they are recognized as members of the Winnipeg cessitated the selection of two wells which reached total Formation. depth in Silurian rocks, seven which reached Ordovi­ The Bighorn Group, of Middle Ordovician to Early cian rocks, and only four which reached the Precam­ Silurian ( ?) age, includes the Red River, Stony Moun­ brian. tain, and Stonewall Formations. The Red River is Data and correlations are based on information from predominantly brownish-gray limestone with some do­ the North Dakota Geological Survey records in Grand lomite and thin anhydrite beds in the upper part. The Forks. The writer logged most of the wells, except subdivisions of the Red River recognized in South Da­ where sample descriptions were available from North kota (units A, B, and C) can be traced into North Da­ Dakota Geological Survey files. Logs for wells I and IS kota, but they have not been recognized formally. The were provided, respectively, by R. A. Schoon of the Stony Mountain Formation is divided into two mem­ South Dakota Geological Survey and G. L. Hutch of bers. The lower, or Stoughton Member, consists of the Saskatchewan Department of Mineral Resources. medium-gray, argillaceous limestone and calcareous Terminology for these wells corresponds to that used shale. The upper, or Gunton Member, is yellowish­ on Plates 4 and 6 of the cross section. brown dolomite. The Stonewall Formation is light.gray and light-brownish-gray dolomite with some thin beds of STRATIGRAPHY anhydrite. The Deadwood Formation is of Late Cambrian to The Silurian Interlake Formation may be divided Early Ordovician age in the. central basi~ area. T?e into three units in North Dakota, mainly on the basis precise position of the systemIc boundary IS uncertam. of mechanical-log markers. The lower and middle units Only wells 4, 8, 10, and II penet:ate th~ compl~te are composed of pale-orange, light-yellowish-gray or Deadwood section. In these wells It consIsts of m­ light-brownish-gray dolomite with some light-gray to terbedded white to light-gray sandstone, medium-gray white chert. The upper unit consists of light-brownish­ and greenish-gray shale, and light-gray,. fossiliferous, gray dolomite and calcareous dolomite. fragmental limeston~. The anomalously thm Deadwood The Elk Point Group, of Middle Devonian age, in­ section in well 10 is the result of deposition over a mo­ cludes the Winnipegosis and Prairie Formations in North nadnock of Precambrian rocks. Dakota. Rocks equivalent to the Ashern Formation of The Winnipeg Group of Middle Ordovician age has Saskatchewan probably are included in the lower part been divided into three formations in North Dakota of the Winnipegosis, which is a dark-brown, argillaceous limestone. The upper Winnipegosis is generally dark­ 1 Manuscript received, June 26, 1967. brown limestone with thin anhydrite layers in a few 2 North Dakota Geological Survey. wells. The Prairie is predominantly halite, but the very 13 PALEOZOIC ROCKS, OKLAHOMA TO SASKATCHETVAN radioactive zones probably contain potash. Near its duce new terms, they redefined the Frobisher-Alida, southern limit some carbonate beds are also present. Ratcliffe, and Poplar units on the basis of these mark­ The Manitoba Group, of Middle to Late Devonian ers, accepted the Tilston unit, and replaced the term age, includes the Dawson Bay and Souris River Forma­ "Souris Valley" with the term "Bottineau" (Smith, tions. The Dawson Bay consists mainly of Iight- to dark­ 1960). The North Dakota correlations are based on brown dolomite and limestone. The Souris R;ver For­ these redefinitions. mation reflects a change to cyclic deposition of brown­ The Late Mississippian Big Snowy Group includes ish-gray limestone. dolomite, and thin ~hale beds. the Kibbey and Otter Formations. The Kibbey com­ The Late Devonian Saskatchewan Group includes prises a lower reddish-brown shale and siltstone, a mid­ the Duperow and Birdbear Formations. Cyclic deposi­ dle light-gray limestone, and an upper pinkish-gray tion continued, but shale is a minor constituent and sandstone. The Otter consists of variegated shale. evaporites are more abundant. The Duperow is predom­ The Tyler Formation, of Late Mississippian(?) to inantly light-brown to brownish-gray limestone with thin Early Pennsylvanian age, consists of interbedded sand­ beds of anhydrite in the upper part. The Birdbear con­ stone and variegated mudstone and shale. sists mainly of pale-brown limestone with some anhy­ The Pennsylvanian Amsden Formation consists of drite. interbedded light-gray to pinkish-gray limestone, sand­ The Three Forks Formation is also of Late Devonian stone, and red calcareous shale. The Minnelusa Forma­ age. It consists of reddish-brown shale, anhydrite, and tion is mainly white to pinkish-gray sandstone with dolomite in the lower part, and interbedded greenish­ some dolomite. Use of the Pennsylvanian-Permian ter­ gray shale and pale-orange dolomite and siltstone in the minology of South Dakota is practical northward to upper part. wells 4 and 5, but the terminology has not been ac­ The Bakken Formation, of Late Devonian to Early cepted in North Dakota. North of these wells, use of Mississippian age, may be divided into three lithologic the South Dakota terminology becomes difficult, as is units-a lower brownish-black shale, a middle light-gray, correlation of an Amsden-Minnelusa contact. Therefore, calcareous siltstone and silty limestone, and an upper no "arbitrary" lines of correlation are shown for this black shale. part of the section. The Madison Group, of Early Mississippian to Late Permian rocks make up the Opeche and Minnekahta Mississippian age, has been divided into the Lodgepole, Formations and the lower part of the Spearfish Forma­ Mission Canyon, and Charles Formations. The terms tion. The Opeche Formation consists of halite and "Lodgepole" and "Mission Canyon" are derived from redbeds, and the Minnekahta is light-gray and pinkish­ outcrop areas in central Montana, and the term gray limestone. "Charles" from the subsurface in eastern Montana. As exploration of the basin proceeded, it became evident STRUCTURE that three gross lithologic types were recognizable in The cross section extends from the southern flank of the basin and the threefold surface terminology was the Williston basin through the central part to the extended into the subsurface. The light- to dark-gray, northern flank. Two major folds, the Cedar Creek and argillaceous or cherty, generally dense limestone was Nesson anticlines, are present in this area. referred to as the "Lodgepole Formation." The brown­ The Cedar Creek anticline is a southeast-trending ish- to yellowish-gray, fragmental, pelletoidal, and oolitic fold in eastern Montana which extends across south­ limestone beds were designated as "Mission Can­ western North Dakota. Wells 1-3 are on the northeast yon." The predominantly evaporitic facies, consisting of flank of this feature. The Nesson anticline trends halite and anhydrite, was named the "Charles Forma­ northward in the central basin area. Wells 7-13 are tion." along its axis. Because these facies intertongue and cross time planes, it became evident that subdivisions based on GEOLOGIC HISTORY marker units would be more useful for petroleum explo­ Because most of the Paleozoic systemic boundaries ration than the formational terminology. Fuller (1956) are within formational units, it is easiest to present the proposed such subdivisions, which were revised and geologic history if the stratigraphic column is separated a.dopted by the Saskatchewan Geological Society into four major unconformity-bounded units or "se­ (1956). The revised terminology is shown for well IS. quences" (Carlson and Anderson, 1965). The four se­ The Mississippian Committee of the North Dakota quences recognized are the Sauk, Tippecanoe, Kas­ Geological Society subsequently found gamma-ray kaskia, and Absaroka (Sloss, 1963). markers more useful for basin-wide correlations than The Sauk Sequence consists of shelf-type rocks the markers proposed by Fuller, but rather than intro­ deposited in the Late Cambrian-Early Ordovician seas NORTH DAKOTA 15 which spread over the a:ea from the west.
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