Muddy sandstone. Muddy sandstone powder river basin. Web9 Oct 2019 · ...

The lower Muddy sandstones are preserved as infill of a dendritic

One is the 97 ± m.y. unconformity, with which the petroleum-producing J and Muddy Sandstone is related. A second is 90 ± m.y. unconformity which is recognized by relationships within the shelf, slope, and basin deposits of the Greenhorn, Carlile, and Frontier formations. The third is the 80 ± m.y. unconformity within the basin and shoreline ...shale, any of a group of fine-grained, laminated sedimentary rocks consisting of silt- and clay-sized particles.Shale is the most abundant of the sedimentary rocks, accounting for roughly 70 percent of this rock type in the crust of the Earth.. Shales are often found with layers of sandstone or limestone.They typically form in environments where …Subsidence continued, possibly submerging all of the Waiheke “paleoisland”. Muddy sandstone, which continued to accumulate around the drowned rocky high, only began filling the northeastern depression when it had subsided to mid‐shelf depths. The highest sediments at W Bay and Oneroa record continued deepening to outer shelf depths.Geology of Singapore - Society For Rock Mechanics & Engineering ...Regional diagenetic trends in the Lower Cretaceous Muddy Sandstone, Powder River basin; discussion and reply Andrew Hajash; Andrew Hajash Tex. A&M Univ., Geol. Dep., College Station, TX, United States. Search for other works by this author on: GSW. Google Scholar. William R. Almon;The Zhengyuanling Formation is dominated by sage green and violet pebbly, muddy sandstone and siltstone (diamictite, Fig. 3 e). The diamictite has a mud matrix supported and contains up to 10% of angular to sub-rounded clasts (0.2–5 cm in size). It is overlain by thick unit of mudstones and asymmetrical ripple marked fine-grained …The south flank of the anticline is capped with south-dipping Muddy Sandstone and the conglomerate sandstones of the Cloverly Formation. The Cretaceous Cloverly Formation forms a prominent hogback, known as Como Bluff. The Morrison Formation, where a large number of the dinosaur bones were found, is exposed along the northward-facing, steep ...Home to sandstone domes, canyons, and arches, Capitol Reef National Park should be way up there on your Utah bucket list. Sixty-five million years ago, the same immense forces that lifted the Colorado Plateau and shaped so much of the Ameri...mud cake to penetrate the strata, and the resulting microlog will indicate resistivities close to that of the mud. Induction Log Induction logging is performed in dry boreholes or boreholes containing nonconducting fluids. Induction logging can be done in holes cased with polyvinyl chloride (PVC) casing. The induction logger is housed in a sondeDSİ 1.Bölge Müdürlüğü Bursa, Bursa. 3.264 beğenme · 113 kişi bunun hakkında konuşuyor · 4.768 kişi buradaydı. DSİ 1.Bölge Müdürlüğü Resmi Facebook Sayfasıdır.Muddy sandstone is the major lithology in this area (sample ZJG-10). At ZJG, the damage zone is a muddy sandstone breccia containing gray clasts cemented by a dark fine-grained matrix. Sample ZJG-1 was collected from the hanging wall. Samples ZJG-7, -8, and -9, crushed to differing degrees, were collected in the foot wall, at 30 cm, …The Annot Sandstone (Upper Eocene-Oligocene), cropping out in south-eastern France (Fig. 1 A), is a widespread turbidite succession preserved mainly in NS-stretched synclines (Fig. 1 D) in an Alpine foreland basin, located to the west of the developing Alpine thrust belt and north of the emergent Pyrenean–Provencal mountain …Geology of Singapore - Society For Rock Mechanics & Engineering ...Because the lower Muddy was deposited during a southeast to northwest regression, the sandstones are progressively younger toward the northwest. However, the overlying nonmarine upper Muddy thickens northwestward, causing the underlying regressive sandstone to appear to be stratigraphically lower and, hence, older in that direction. Greatest gas production from the Muddy (J) Sandstone in Wattenberg field occurs (1) from within the most permeable and thickest intervals of Fort Collins Member delta-front and nearshore-marine sandstones, (2) to a lesser extent from the Horsetooth Member valley-fill channel sandstones, (3) in association with a large thermal anomaly that is ...Are you looking for a reliable and powerful off-road vehicle that can handle all your outdoor adventures? Look no further than the Honda Pioneer 1000 5 Seater. This versatile side-by-side is perfect for taking on any terrain, from sand dune...Play Type 4 - Muddy Sandstone Stratigraphic Play Play Types 5,6,7 - Phosphoria Stratigraphic, Bighorn Wedge-Edge Pinchout Flathead-Lander and Equivalent Sandstone Play Play Types 8,9,10,12 - Madison Limestone, Darwin-Amsden Sandstone Triassic and Jurassic Stratigraphic, Cody and FrontierWhat is the porosity of newly deposited mud? less than 5% between 5% and 25% between 25% and 50% > 50%. Which of the following groups represent the most abundant sedimentary rocks? limestones and dolomites sandstones and conglomerates cherts and evaporites mudstones and shales. What type of sandstone is depicted in the illustration …The Bardas Blancas Formation being 170–220 m thick in the study area is dominated by muddy sandstones and sandy mudstones, and it also includes subordinate proportions of clean sandstones and pure mudstones, collectively representing different environments of a storm-influenced shoreface-offshore system. The offshore transition …muddy sandstones associated with Costellamussiopecten cristatum , Korobkovia oblonga (Philippi, 1844) and Neopycnodonte navicularis form thick successions inMuddy sandstone fine-grained gray color, with carbonaceous mudstone sheets and planar parallel lamination Sand fine Lower flow velocities - Overbank, abandoned channel or waning flood deposits Lower flow velocity, with intermittent supply of organic matter with signs of conditions related to reducing environments St২৮ এপ্রি, ২০১৯ ... Ferron Sandstone, Muddy Creek, Utah #2. 91 views · 4 years ago ...more. Peter Flaig. 12. Subscribe. 12 subscribers. 3. Share. Save. Report ...ABSTRACT. The Upper Cretaceous Sussex "B" sandstone was deposited as a probable transgressive-marine sand-ridge complex in a mid-shelf position. The "B" sandstone is bounded by upper and basal disconformities and encased in mudstones and low-porosity and low-permeability sandstones of the Cody Shale. Reservoir characteristics are controlled ... @article{osti_5878330, title = {Reservoir description and production history; Bell Creek field, Muddy sandstone, barrier island, and valley fill deposits}, author = {Tillman, R W and Szpakiewicz, M and Honarpour, M M and Jackson, S R}, abstractNote = {Improved sedimentologic and stratigraphic reservoir descriptions of barrier-island sandstones and genetically related deposits allow better ...The lowest, sixth Muddy sandstone is fluvial in origin, and the overlying fifth sandstone is a transgressive marine deposit. The fourth zone represents a fluvial origin below to shallow marine above. The third zone is interpreted to be of fluvial-overbank origin with possibly a bay-lagoonal association. The Muddy Sandstone, although commonly less than 100 ft thick, is one of the most complicated formations in the Powder River basin. Utilizing an integrated sedimentologic …Sandy Sandstone (firmly known as Mr. Sandstone) is the boss and mogul of Miracle Pictures in Hollyrock and a one-time character of the episode, "The Monster from the Tar Pits", featured in the first season of the original series, "The Flintstones. Sandy is a tall and stout caveman with fairly tan skin, tan stubbles, red hair, a red mustache, thick black eyebrows and black beady eyes. He wears ...This animation shows the process of formation of sandstone (hard rock) via the accumulation of grains of sand (sediments) at the bottoms of oceans.(3) Very fine- to fine-grained sandstone and siltstone with abundant ripple cross bedding (Sr), graded bedding and more locally, muddy sandstones affected by soft-sediment deformation (Sd), and chaotically deformed beds (Fig. 4 I). In general, these fine-grained sandstones and dark colored mudstones (Fc or Fb) can exhibit a coarsening …Dec 13, 2019 · Over 4,000 gross mineral acres available for lease in Converse County, Wyoming. This position provides a great opportunity to secure operatorship between Anschutz and Century Oil and Gas. The property is located directly in line with the prolific Clareton Muddy Sandstone trend. Sedimentary rock - Clastic, Chemical, Organic: There are many different systems of classifying sandstones, but the most commonly used schemes incorporate both texture (the presence and amount of either interstitial matrix—i.e., clasts with diameters finer than 0.03 millimetre—or chemical cement) and mineralogy (the relative amount of quartz and the …May 3, 2014 - Aztec Sandstone at the Muddy Mountains Wilderness. Nevada Proud!!!6.1 Clastic Sedimentary Rocks A clast is a fragment of rock or mineral, ranging in size from less than a micron [1] (too small to see) to as big as an apartment block. Various types of clasts are shown in Figure 5.12 and in Exercise 5.3. The smaller ones tend to be composed of a single mineral crystal, and the larger ones are typically composed of …Mar 12, 2023 · Muddy sandstone was chosen for the test. First, the specimen was processed into a standard specimen of size φ50 mm × 100 mm; then, it was processed into a specimen with a single penetration fissure of uniform roughness. Crack size was 20 mm × 2 mm and the angle 45° . The experiment utilized a 1:1 water-to-cement ratio to regulate the cement ... The structured muddy sandstone beds are overlain directly by mudstone (P = 0.31) or by the following facies in order of decreasing P values: siltstone (P = 0.41), structured sandstone (P = 0.23) and heterolithic sandstone–mudstone (P = 0.04). The structured muddy sandstone facies is the primary facies of interest in this study.muddy sandstones associated with Costellamussiopecten cristatum , Korobkovia oblonga (Philippi, 1844) and Neopycnodonte navicularis form thick successions inSandstone: A sedimentary rock used primarily for concrete and masonry work. It is unsuitable for use as a building stone because of its sediment composition. Slate: A metamorphic rock typically found in layers. Because it is easily mined and cut in these natural layers, it works well in applications requiring thin rock layers.Muddy Sandstone Environments, Powder River Basin, Wyoming and Montana: Outcrop and Core Study Roderick W. Tillman Cities Service Exploration and Production Research, Tulsa, Okla. Search for other works by this author on: Cities Service Exploration and Production Research, Tulsa, Okla. Publisher: American Association of Petroleum GeologistsDelmar Formation consists of dark green claystone and mudstone, greenish-gray muddy sandstone, interbeds formed by biostromes of shells of molluscs. Setting. Frederiksen places the Delmar Formation and overlaying Torrey Sandstone above the Mount Soledad Formation and below Ardath Shale within the early Lutetian in calcareous nannofossils …May 1, 2021 · The Muddy sandstone is a Lower Cretaceous sequence that was deposited on the east flank of the Powder River Basin in Wyoming and southeastern Montana. The formation is characterized by variations in thickness and lithology as a result of recurrent movement on basement fault blocks during the Laramide orogeny. Muddy/Newcastle Sandstone (Lower Cretaceous) incised - valley fill reservoir. Underpinned by major basement lineaments (Fiddler Creek and Weston/Hat Creek). Introduction Generalized stratigraphic cross section of the Muddy Fm., showing member level stratigraphy.Although operators did produce from conventional wells in Cretaceous reservoirs such as the Muddy Sandstone (western equivalent of the Newcastle Sandstone), Frontier Formation, and the Carlile Shale, …১৫ মে, ২০১৮ ... (N) At Jebel Lemda, alternations of marlstone, muddy siltstone and cross-stratified muddy sandstone, contain slope/shelf edge-type benthic ...Geology of Singapore - Society For Rock Mechanics & Engineering ...৩ দিন আগে ... Check out Pert Near Sandstone with The Muddy Souls at Jack London Revue in Portland on October 20, 2023 and get detailed info for the event ...The Upper Muddy sandstone is located at or near the top of the Muddy interval and is separated from the top of the Lower Muddy sandstones by approximately 30-50 feet of shale. The Upper Muddy is much thinner than the Lower Muddy, but more uniform in thickness. As shown on Plate 3, the Upper Muddy only reaches a maximum thickness of ...Muddy sandstone is the primary hydrocarbon (gas) reservoir facies in inner-shelf successions. Geophysical well-logs can be interpreted to distinguish carbonates from siliciclastics in middle-shelf successions. Relatively siliciclastic-free carbonates typically show conspicuously low radioactivity, whereas siliciclastics are more radioactive.Shale is a fine-grained sedimentary rock that forms from the compaction of silt and clay-size mineral particles that we commonly call "mud." This composition places shale in a category of sedimentary rocks known as " mudstones ." Shale is distinguished from other mudstones because it is fissile and laminated.Abstract. Valley-fill deposits of the Lower Cretaceous Muddy Sandstone contain significant stratigraphically trapped hydrocarbon accumulations and are an …Sandstone is a sedimentary rock. Sandstone is a detrital rock formed from the aggregation and cementing of sand grains. The colour of sandstone becomes more intense …Usage: Muddy Sandstone (MT*,ND*,SD*,WY*) Muddy Sandstone of Dakota Group (CO,WY) Muddy Formation (WY) Muddy Sandstone Member of Thermopolis Shale (WY*) Subunits: FORMATION STATUS (alphabetical): Fort Collins Member (CO), Horsetooth Member (CO*). Geologic age: late Early Cretaceous (Albian)* Type section, locality, area and/or origin of name:I will not be silent about the vastness of that love. In 1988, I met Jesus on a muddy hillside in Pennsylvania. I had caught glimpses before, but there, with the smell of pine needles and the body odor of a few hundred unwashed humans, I sa...Mud-poor sandstones and limestones are characteristically thinly bedded (3-10 em thick) in subhorizontal wavy- and lenticularly stratified units and, less commonly, in tabular cross-stratified sets. The typical flaggy appearance of these latter lithologies in outcrop reflects this thinly bedded stratification.The Upper Muddy sandstone is located at or near the top of the Muddy interval and is separated from the top of the Lower Muddy sandstones by approximately 30-50 feet of shale. The Upper Muddy is much thinner than the Lower Muddy, but more uniform in thickness. As shown on Plate 3, the Upper Muddy only reaches a maximum thickness of ...The Muddy Sandstone in the Powder River Basin (PRB), northeast Wyoming, is a promising reservoir for CO 2 sequestration because: (1) existing wells for …the Muddy, and the black fissile shale overlying the Muddy Sandstone is included in the Mowry. Paull ( 1957) advocated the retention of the original definition of the Mowry to include only the siliceous shale and proposes the term Shell Creek Shale for the black fissile unit between the top of the Muddy Sandstone and the base of the Mowry Shale ...Mudstone. Mudstone, a type of mudrock, is a fine-grained sedimentary rock whose original constituents were clays or muds. Mudstone is distinguished from shale by its lack of fissility (parallel layering). [1] [2] The term mudstone is also used to describe carbonate rocks ( limestone or dolomite) that are composed predominantly of carbonate mud. [3]Mud content increases upwards in the facies S4 beds, and their upper contacts exhibit dewatering structures, with injections of muddy sand into the overlying sandstones (Figs. 7 G). The S4 facies is interpreted to represent unlithified, saturated muds and fine-grained sands upon which sands were deposited rapidly.Gravelly muddy sand Gravelly muddy sandstone Gravelly sand Gravelly sandstone 90 SAND Sand Sandstone Per cent sand Muddy sand Muddy sandstone Sandy mud Sandy mudrock . Standard deviation' = 0.35 deviation' = 1.0 'Standard deviation' = 0.5 'Standard deviation' = 2.0 .Thinly interbedded sandstone and bioturbated mudstone. The interbeds are only 0.5–5 cm thick. The sandstone beds are silty and contain abundant mud drapes. The mudstone beds are well bioturbated. The environment is interpreted as a mixed to muddy tidal flat. Thick stacked sandstone sequences. Original Rock: sandstone Environment: Quartzite forms at many temperatures and pressures. Distinguishing Characteristics: light grey or white, medium grained, very hard. Origin of your Samples: Badgeley Island, Ontario Uses: Quartzite is the raw material for the glass and ceramics industries. Quartzite samples courtesy of Unimin Canada Ltd ...In this study, the inclined sandstone specimen is introduced into cyclic loading tests to fulfill the coupled compression-shear loading state. 21 cyclic coupled compression-shear loading tests are ...This animation shows the process of formation of sandstone (hard rock) via the accumulation of grains of sand (sediments) at the bottoms of oceans.Mar 1, 2022 · (E) Example of soft-sediment deformation commonly observed in hummocky-cross stratified sandstone (FA2, offshore transition). (F) Coarsening-up heterolithic to muddy sandstone package (FA3, lower shoreface). (G) Wavy-laminated muddy sandstones (FA3, lower shoreface). Field photos of the different facies recognized in the study area. Tight gas is commonly used to refer to natural gas produced from reservoir rocks with such low permeability that massive hydraulic fracturing is necessary to produce the well at economic rates. The gas is sealed in very impermeable and hard rocks, making their formation "tight". These impermeable reservoirs which produce dry natural gas are ...muddy sandstone (ratio 1:1 to 9:1), sandy mudstone (ratio 1:9 to 1:1), and, TABLE 1"* TERMS APPLIED TO MIXTURES OF GRAVEL, SAND, AND MUD DELIMITED IN FIGURE 1 Major Textural Class A. Gravel. Conglomerate B. Sandy gravel Sandy conglomerate C. Muddy sandy gravel. Muddy sandy conglomerate D. Muddy gravel Muddy conglomerate E. Gravelly sand ...The Muddy sandstone is a Lower Cretaceous sequence that was deposited on the east flank of the Powder River Basin in Wyoming and southeastern Montana. The formation is characterized by variations in thickness and lithology as a result of recurrent movement on basement fault blocks during the Laramide orogeny.FA5 mainly comprises medium-thick bedded medium-coarse grained sandstone and thin beds of muddy sandstone, with bell or box-shaped gamma-ray curves, and the whole succession fines upward generally (Fig. 3 A, D). Download : Download high-res image (840KB) Download : Download full-size image;Tight gas is commonly used to refer to natural gas produced from reservoir rocks with such low permeability that massive hydraulic fracturing is necessary to produce the well at economic rates. The gas is sealed in very impermeable and hard rocks, making their formation "tight". These impermeable reservoirs which produce dry natural gas are ...G) Close-up view of muddy matrix-supported breccia of the Atshan Formation, Wadi El-Dabbah, eastern NE domain. This is a >20-m-thick debris flow deposit that formed in a channel within the bedded mud and sandstone sequence. Looking south at Wadi El-Dabbah. H) Well-bedded red bed sequence within the Hammamat Group.Mar 1, 2023 · P-wave velocity (c) and attenuation (d) of muddy sandstone versus frequency for different fl uids and clay contents (Φ = 10%). The microfracture porosity of the rocks is 0.1%. the Muddy, and the black fissile shale overlying the Muddy Sandstone is included in the Mowry. Paull ( 1957) advocated the retention of the original definition of the Mowry to include only the siliceous shale and proposes the term Shell Creek Shale for the black fissile unit between the top of the Muddy Sandstone and the base of the Mowry Shale ... Molenaar, C.M. and Cobban, W.A., 1991, Middle Cretaceous stratigraphy on the south and east sides of the Uinta basin, northeastern Utah and northwestern Colorado, IN Evolution of sedimentary basins; Uinta and Piceance basins: U.S. Geological Survey Bulletin, 1787-P, p. P1-P34. Jan 1, 2003 · Production in Peoria is from a Lower Cretaceous Muddy "J" channel sandstone, with a maximum thickness of 45 ft. Average porosity values are 14.7% with permeabilities averaging 200 md and ranging ... This allowed a coral reef to build on top of the mud. A more geological time passed and the environment of the area changed again, the deposits of sand, mud, and carbonate sediment were buried and lithified into the sequence of sedimentary formations which, from bottom to top, are sandstone, shale, and limestone.Getting a fishing boat can mean a lot more freedom to pursue your favorite hobby away from crowded piers and muddy riverbanks. Ask yourself these questions as you look for fishing boats on sale so you can be sure to make a smart choice that...Eventually, in warm water, it may become a place where lime mud accumulates. Thus, from bottom to top, as the sea transgresses across an area it will leave a sedimentary sequence of sand overlain by mud overlain by lime. If these layers are buried deeply enough to be lithified into sedimentary rock, they will become sandstone, shale …See full list on sandatlas.org Lithology means "the composition or type of rock such as sandstone or limestone." These few words belie a host of details about reservoir rocks: Their depositional and diagenetic history ... of a new oil or gas reservoir is understood on a preliminary basis by the wellsite geologist’s description of mud-shaker cuttings and possibly by a few ...Production in Peoria is from a Lower Cretaceous Muddy "J" channel sandstone, with a maximum thickness of 45 ft. Average porosity values are 14.7% with permeabilities averaging 200 md and ranging ...Wyoming contains a wide variety of granite, marble, sandstone, quartzite, gneiss, limestone, and volcanic rocks suitable for use as decorative stone. Because the United States imports approximately 80 percent of the dimensional stone used in interior and exterior construction, the decorative stone industry has great potential for growth. Home to sandstone domes, canyons, and arches, Capitol Reef National Park should be way up there on your Utah bucket list. Sixty-five million years ago, the same immense forces that lifted the Colorado Plateau and shaped so much of the Ameri...southwestern Wyoming, lower Cretaceous Muddy Sandstone, and other. Cretaceous sandstone reservoirs. In the reservation area, the Mowry shale may range ...The 83.9 km location belongs to the Erjiu section of the Kueichoulin Formation, which mainly consists of muddy sandstone and shale . The abundance of vertical joints has created steep rock faces and, on the northeast coast, many of the rock faces are concave due to differential erosion caused by the ocean wind in the muddy …Mud cracks form when a shallow body of water (e.g., a tidal flat or pond), into which muddy sediments have been deposited, dries up and cracks (Figure 6.24). This happens because the clay in the upper mud layer tends to shrink on drying, and so it cracks because it occupies less space when it is dry. ... Quartz sandstone: no feldspar, well ...May 3, 2014 - Aztec Sandstone at the Muddy Mountains Wilderness. Nevada Proud!!!mud cake to penetrate the strata, and the resulting microlog will indicate resistivities close to that of the mud. Induction Log Induction logging is performed in dry boreholes or boreholes containing nonconducting fluids. Induction logging can be done in holes cased with polyvinyl chloride (PVC) casing. The induction logger is housed in a sondeMar 1, 1991 · The Muddy Sandstone, although commonly less than 100 ft thick, is one of the most complicated formations in the Powder River basin. Utilizing an integrated sedimentologic and stratigraphic analysis of outcrop, core, and well logs, the Muddy can be divided into six isochronous members. Included in this play are oil and minor gas from the J sandstone of the Muddy Sandstone of the Dakota Group, and the overlying D sandstone, both Lower Cretaceous units. The production fairway of the play is located in the central and northeastern parts of the basin, covering approximately half the province. Tilted muddy sandstone (wacke) layers on the eastern coast of Ireland. Strongly cemented sandstone from Estonia from the Proterozoic (it formed roughly 1.4 billion years ago). Width of sample 4 cm. Sandstone is usually known as layered and often cross-stratified sedimentary rock, but sometimes it may form even columns.Frontier Formation (Kf) - Gray sandstone and sandy shale. In Northern Yellowstone area, Yellowish- to medium-gray sandstone; tuffaceous and carbonaceous in lower part. Mowry Shale (Kmr) - Silvery-gray hard siliceous shale containing abundant fish scales and bentonite beds. Thermopolis Shale - Black soft fissile shale; Muddy Sandstone Member at top.Apr 29, 2022 · The moderately weathered muddy sandstone involved in this study has no obvious joints, so the HB model is used. There are seven main parameters in the HB model, including heaviness γ , Poisson’s ratio ν , Young’s modulus E , uniaxial compressive strength σ ci , intact rock material constant m i , geological strength index GSI , and ... Henares et al., (2016) show that the occurrence of variable amounts of mud-clasts within fluvial sandstones of the Triassic Bigoudine Formation, in the Argana Basin, favours early reduction of the .... The H3 muddy sandstone (Fig. 7 F) shows a higher The laminated muddy sandstone records low-energy fair-weather-wave [Abstract Base‐salt relief influences salt flow, producing three‐dimensionally complex strains and multiphase deformation within the salt and its overburden. Understanding how base‐salt relief influences salt‐related deformation is important to correctly interpret salt basin kinematics and distribution of structural domains, which have important implications to understand the ...Wyoming contains a wide variety of granite, marble, sandstone, quartzite, gneiss, limestone, and volcanic rocks suitable for use as decorative stone. Because the United States imports approximately 80 percent of the dimensional stone used in interior and exterior construction, the decorative stone industry has great potential for growth. muddy sandstone (ratio 1:1 to 9:1), sandy mudstone (ra Sandstone is a clastic sedimentary rock composed of sand-sized grains of mineral, rock or organic material.23. Map showing relation between Fall River Sandstone delta system and Fall River production at Buck Draw field, Powder River Basin, Wyoming..... 27 24. Generalized cross section of Muddy Sandstone depositional environments and Abstract. The Muddy Formation in the N. Powder River Basin of Wy...

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