Figure 1. Geologic map and cross section of part of the North American Midcontinent Rift. (A) Regional map showing location of the Grenville Front relative to the study area. (B) Geologic map of northern Michigan and Wisconsin showing geochronology sample locations, major thrust faults, and location of cross section (a–a ′) shownAeromagnetic base map of the Midcontinent Rift, which crosscuts Archean crust nor th of the Niagara. suture, Penokean accreted terranes, and Yavapai and Mazatzal crust to the south (NICE 2006).Similarities between rocks of the Midcontinent rift and rocks that host the Voisey Bay nickel-copper-cobalt deposit in Labrador, Canada, and the Noril'sk nickel-copper-platinum-group-metals deposits in Russia suggest a high potential for such sulfide deposits in rocks associated with the 1.1-billion-year-old Midcontinent rift in the Lake ...Scientist Emeritus [email protected] The 1.1 Ga Midcontinent rift system of North America is one of the world's major continental rifts and hosts a variety of …Precise resolution of the timing of igneous activity is crucial to understanding the dynamic processes associated with continental rifting. Mafic intrusive rocks constitute a major portion of the exposed 1100 Ma (Keweenawan) Midcontinent Rift system in northeastern Minnesota; however, prior to this study, geochronological data were …Volcanism within the North American Midcontinent Rift between ca. 1109 and 1083 Ma, as well as other contemporaneous volcanism within Laurentia, has provided an opportunity to develop extensive paleomagnetic data sets spanning this time period.Nov 21, 2018 · The fault patterns shown on our maps are similar to patterns observed in the outcrop belt in Minnesota. Wisconsin, and Michigan. Figure 1—Location of study area shown on maps M-45:1 and M-45:2. Acknowledgments. This study of the Midcontinent Rift System was supported by a grant of the U. S. Geological Survey (Award No. 018785-910). The Midcontinent Rift System is a 1.1 Ga failed continental rift in the Midwestern United States and Canada (Fig. 1).This area contains ~ 1 – 2 × 10 6 km 3 of mafic igneous rocks (Hutchinson et al. 1990; Merino et al. 2013).Rift-related volcanism includes voluminous tholeiitic flood basalt flows, minor picritic flows, and some …Figure 1a) Bouguer Gravity map of the Midcontinent Rift (Stein et al., 2014). The location of the Grenville orogeny, credited with ending the period of rifting forming the MCRS, is indicated on the map. The star indicates the location of this study’s field site (shown in more detail in Figure 2). TheThe midcontinent rift (Precambrian in age) starts in northern Kansas and runs under Lake Superior and then turns south to run through lower Michigan. It was similar to the East Africa rift as parts of the continent tried to separate, but were ultimately unsuccessful in the attempt to break into separate land masses.A map of Michigan showing Bedrock Geology with a brief description of its major divisions and generalized stratigraphy. Download at the link above. Image is a low resolution preview. Earth and Environmental Sciences. Room 2534 …Jan 25, 2018 · The USGS has just released a new interactive Story Map describing the Mineral Deposits of the Midcontinent Rift System. The Midcontinent Rift System, which curves for more than 2000 km across the Upper Midwest, is one of the world’s great continental rifts. THE MIDCONTINENT RIFT The bedrock geology of the western Upper Peninsula of Michigan is dominated by the 1.15–1.0 Ga Midcontinent Rift that extends more than 2000 km from Kansas through the Lake Superior Region and down to lower Michigan (Figs. 1 and 2). Beneath Lake Superior, the rift is fi lled with more than 25 km offeatures as due to an incipient rift system goes back many years (e.g. Lyons 1959, King & Zietz 1971), and these features have been referred to as the "central North American rift system" (Ocola & Meyer 1973) or, more simply, the "midcontinent rift system" (Wold & Hinze 1982). In this review New Insights into North America’s Midcontinent Rift (2020). For ppt click here. Information for national and state park interpreters: Stein, S., C. Stein, E. Blavascunas, and J. Kley, Using Lake Superior parks to explain the …Generalized geology of the Lake Superior region with Midcontinent Rift-related intrusions, showing the location of the Tamarack intrusion, the Eagle intrusion, and the Duluth Complex relative to ...Property line maps are an important tool for homeowners, real estate agents, and surveyors. These maps provide detailed information about the boundaries of a property, including the location of fences, walls, and other structures.Dec 4, 2013 · The volcanic rocks are remnants of what is called the Midcontinent Rift, and it is an enormous geological puzzle. Rifts are wounds in Earth's outer layer that can grow to eventually form new oceans. North America's ~1.1-Ga failed Midcontinent Rift (MCR) is a striking feature of gravity and magnetic anomaly maps across the continent. However, how the rift affected the underlying lithosphere is ...Mesoproterozoic Midcontinent Rift Native Copper occurrences Several Abundant Chalcocite occurrences Several Abundant Lake Michigan Midcontinent Rift FIG. 1. Generalized bedrock geologic map of the Midcontinent rift of the Lake Superior region and the Upper Peninsula of Michigan showing locations of copper deposits and occurrences ...The Reelfoot rift is identified today as a subsurface system of fractures and faults in the earth's crust. New Madrid seismicity is spatially associated with the Reelfoot rift and may be produced by movement on old faults in response to …Feb 24, 2015 · Called the Midcontinent Rift System (MCRS), this structure is a 1.1 billion–year–old, 1,864-mile (3,000 km) long, mostly buried scar along which the North American continent started to tear apart. However, the rifting stopped for some reason and failed to form a new ocean. Mar 1, 2018 · The Keweenawan Midcontinent rift system was imposed upon the terrane suture in our study area at ca. 1100 Ma. This event nearly separated the ancient continent and imparted enormous volumes of mafic magma to various depths in the crust (Hinze et al., 1997; Nicholson et al., 1997; Vervoort et al., 2007; Stein et al., 2015), engendering numerous high-grade base and precious metal deposits ... The Midcontinent Rift System (MRS) or Keweenawan Rift is a 2,000 km (1,200 mi) long geological rift in the center of the North American continent and south-central part of the North American plate. It formed when the continent's core, the North American craton, began to split apart during the … See moreAugust 20, 2020 Geophysics of the Midcontinent Rift Region The Midcontinent Rift system and surrounding Precambrian rocks are known to host highly significant mineral resources.1 Introduction. The shallow, dense igneous rocks of North America's 1.1-Ga failed Midcontinent Rift (MCR) System create a striking magnetic anomaly and gravity high that demarcate the rift axis (Chase & Gilmer, 1973; Hinze et al., 1992; King & Zietz, 1971).The system consists of two arms that converge in the Lake Superior region—one …The Michigan Geological Survey's GIS website hosts interactive maps of the surface and bedrock geology of Michigan. The geological maps can be overlain on street, topographic or aerial photographic maps. The GIS data used to create these maps can be purchased on the website for further use and analysis. Click here to access the MGS interactive …The map here shows a much smaller area than the one above, and uses geologic formation names which extend into other parts of North America and even to other continents. At the time of the rift, they were all part of Rodinia, a massive continent which eventually shattered and broke into dozens of pieces.Ideas about a geological scar in the center of North America called the Midcontinent Rift are in the midst of an overhaul. EarthScope’s Transportable Array (TA) and a Flexible Array project called the Superior Rifting EarthScope Experiment (SPREE) have brought in new data that has some scientists rethinking the map of this feature. Nov 1, 2016 · Failed rifting of the North American craton in the Mesoproterozoic left the Midcontinent Rift system (Stein et al., 2016, Van Schmus and Hinze, 1985), and disintegration of the Rodinia supercontinent in the Neoprotozoic left the Reelfoot rift and other rift systems near the eastern margin of the North American continent (Johnston and Kanter ... THE MIDCONTINENT RIFT The bedrock geology of the western Upper Peninsula of Michigan is dominated by the 1.15–1.0 Ga Midcontinent Rift that extends more than 2000 km from Kansas through the Lake Superior Region and down to lower Michigan (Figs. 1 and 2). Beneath Lake Superior, the rift is fi lled with more than 25 km ofDetailed Description. The Midcontinent rift system cuts across terranes ranging in age from 3.6 to 1.65 Ga. The location of the rift south of Lake Superior in Minnesota, Michigan, …Sep 7, 2023 · August 20, 2020 Geophysics of the Midcontinent Rift Region The Midcontinent Rift system and surrounding Precambrian rocks are known to host highly significant mineral resources. Figure 20: Maps illustrating the location of Greenland, Northern Ireland, and Scotland during the late Precambrian (600 Ma; South Pole) and the Last Glacial Maximum (20,000 years …North America's ~1.1-Ga failed Midcontinent Rift (MCR) is a striking feature of gravity and magnetic anomaly maps across the continent. However, how the rift affected the underlying lithosphere is ...Feb 7, 2022 · Some mafic–ultramafic intrusions in the North American Midcontinent Rift System host disseminated to massive sulfides of magmatic origin. Massive sulfides are also present in the immediate sedimentary country rocks to some of these intrusions, such as Partridge River, Tamarack, and Eagle. Our working hypothesis is that the country rock-hosted massive sulfides are also of magmatic origin. To ... Figure 1. Map showing the Midcontinent Rift System and some of the major geological features of the region. Inset box is enlarged in Figure 2a, where the location of Keweenawan volcanic and ... 2. Mapping of the Midcontinent rift system and its importance. The discovery and exploitation of rich native copper deposits in the Keweenawan volcanic and sedimentary rocks of the Lake Superior region in the mid-nineteenth century led to extensive mapping of the Keweenawan Supergroup rocks along the shore of Lake Superior, its islands, and adjacent areas (e.g., Irving, 1883, Lane, 1911, Van ...On the magnetic and gravity maps the Midcontinent Rift is the most prominent feature you see. A quarter-century ago, it was as unknown in scientific mapping. The rift was …Stein, S. et al. Insights from North America’s failed Midcontinent Rift into the evolution of continental rifts and passive continental margins. Tectonophysics 744 , 403–421 (2018). Article ...This paper develops a Monte Carlo algorithm for extracting three-dimensional lithospheric density models from geophysical data. Empirical scaling relationships between velocity and density create a 3D starting density model, which is then iteratively refined until it reproduces observed gravity and topography. This approach permits deviations from uniform crustal …Location of the Midcontinent Rift System in North America (modified from Hauck et al., 1997). Download : Download high-res image (320KB) Download : Download full-size image; Fig. 2. Geologic map of the Lake Superior area showing location of the Partridge River (PRI) and South Kawishiwi (SKI) Intrusions of the Duluth Complex, ...New Insights into North America’s Midcontinent Rift. Solving the Midwest’s Biggest Geologic Mystery. Mysterious Midcontinent Rift is a Geological Hybrid. Sharing Lake Superior’s Secrets. North America’s broken heart (Nature) A real rift in the midcontinent (Earth magazine)Oct 28, 2016 · The Midcontinent Rift is an ancient rift system that could have split the country into two parts a billion years ago. In this live interview at the Sheldon Concert Hall in St. Louis, geologist Michael Wysession discusses how seismologists are using data from earthquakes and gravity measurements to characterize this underground geological scar. The Midcontinent Rift System (MRS) or Keweenawan Rift is a 2,000 km (1,200 mi) long geological rift in the center of the North American continent and south-central part of the North American plate. It formed when the continent's core, the North American craton, began to split apart during the Mesoproterozoic era of the Precambrian, about 1.1 billion years ago. The rift failed, leaving behind ...New Insights into North America’s Midcontinent Rift. Solving the Midwest’s Biggest Geologic Mystery. Mysterious Midcontinent Rift is a Geological Hybrid. Sharing Lake Superior’s Secrets. North America’s broken heart (Nature) A real rift in the midcontinent (Earth magazine) Mapping the depth of the micro configuration of the discontinuity consistent with the relation of. Midcontinent Rift System to the overall Precambrian basement- ...THE MIDCONTINENT RIFT The bedrock geology of the western Upper Peninsula of Michigan is dominated by the 1.15–1.0 Ga Midcontinent Rift that extends more than 2000 km from Kansas through the Lake Superior Region and down to lower Michigan (Figs. 1 and 2). Beneath Lake Superior, the rift is fi lled with more than 25 km ofOne, the Midcontinent Rift (MCR), is a prominent feature in geophysical maps of the region. Due to its size and the availability of geophysical and geological data, the MCR has been the focus of many studies giving insight into its evolution, role in the assembly of Rodinia, and processes of rifting and passive margin evolution (e.g., Green et ...Dec 4, 2013 · The volcanic rocks are remnants of what is called the Midcontinent Rift, and it is an enormous geological puzzle. Rifts are wounds in Earth's outer layer that can grow to eventually form new oceans. The Midcontinent Rift (MCR) in midwestern Canada and the U.S. stopped short of actually splitting North America, and today offers a snapshot of an ancient stage of the continental rifting process. The rift halted 1.1 billion years ago, but its formation shaped the continent as we know it today.On the map above, the rift is labelled the MidContinent Rift and shown in Grey color. ... The map here shows a much smaller area than the one above, and uses geologic formation names which extend into other parts of North America and even to other continents. At the time of the rift, ...View publication. (a) Gravity map showing the Midcontinent Rift (MCR). The west arm extends southward from Lake Superior at least to Oklahoma along the Southern Oklahoma Aulacogen (SOA). The east ...Midcontinent Rift (MCR), the c. 1,100 Ma major rifting event which failed to split Laurentia (the Precambrian core of North America). The Jacobsville also contains a detrital record of collisional events that affected North America starting with the Grenville orogeny, the sequence of events from c. 1.3–0.98 Ga culminating in the assembly This map shows interpreted Precambrian geology for the state of Minnesota ... the Midcontinent rift and the Grenville orogeny; (5) the Neoproterozoic breakup of Rodinia; (6) ...The night sky is filled with stars, planets, and other celestial bodies that can be seen without the aid of a telescope. While it can be difficult to identify individual stars and constellations without a star map, having one can help you g...Nov 21, 2018 · The fault patterns shown on our maps are similar to patterns observed in the outcrop belt in Minnesota. Wisconsin, and Michigan. Figure 1—Location of study area shown on maps M-45:1 and M-45:2. Acknowledgments. This study of the Midcontinent Rift System was supported by a grant of the U. S. Geological Survey (Award No. 018785-910). The Midcontinent Rift System (MRS) (sometimes referred to as the Central North American Rift System or Midcontinent Gravity High) ... Sims, P. K., 1990, Precambrian basement map of the northern midcontinent, U.S.A.: U.S. Geological Survey, Map I …This map shows interpreted Precambrian geology for the state of Minnesota ... the Midcontinent rift and the Grenville orogeny; (5) the Neoproterozoic breakup of Rodinia; (6) ...Abstract and Figures. This chapter discusses the Midcontinent Rift system (MCR). The majority of the rift's igneous rocks are derived from a melting mantle plume and the overlying lithosphere over ...GIS and Information Management - GGGSC. We support the geospatial component of Mineral Resources Program research and provide public access to research results and geospatial information. We facilitate all aspects of the data life cycle, including the publication and archiving of geospatial information and products.Gravity map of the Midcontinent Rift. Credit: Stein et al. 2014. The Midcontinent Rift is an ancient rift system that could have split the country into two parts a billion years ago. In this live interview at the Sheldon Concert Hall in St. Louis, geologist Michael Wysession discusses how seismologists are using data from earthquakes and ...Figure 1a) Bouguer Gravity map of the Midcontinent Rift (Stein et al., 2014). The location of the Grenville orogeny, credited with ending the period of rifting forming the MCRS, is indicated on the map. The star indicates the location of this study’s field site (shown in more detail in Figure 2). TheThe USGS has just released a new interactive Story Map describing the Mineral Deposits of the Midcontinent Rift System. The Midcontinent Rift System, which curves for more than 2000 km across the Upper Midwest, is one of the world’s great continental rifts. Rifting began about 1.1 billion years ago, when the Earth’s crust began to split ...One of the most prominent features on gravity and magnetic maps of North America is the Midcontinent Rift (MCR), an extensive band of buried igneous and …Scientists from Northwestern University, the University of Illinois at Chicago (UIC), the University of Gottingen in Germany and the University of Oklahoma report that the 1.1 billion-year-old Midcontinent Rift is a geological hybrid, having formed in three stages: it started as an enormous narrow crack in the Earth’s crust; that space then ...Map of the Coldwell Complex and Midcontinent Rift associated dykes and sills on the NE and NW shoulders of the Midcontinent Rift. Sample locations for Abitibi, Copper Island, Pukaskwa and ultramafic lamprophyre dykes after Ernst & Buchan (1993, 2010), Magnus (2019), Cundari et al. and Piispa et al., respectively.Map of the Coldwell Complex and Midcontinent Rift associated dykes and sills on the NE and NW shoulders of the Midcontinent Rift. Sample locations for Abitibi, Copper Island, Pukaskwa and ultramafic lamprophyre dykes after Ernst & Buchan (1993, 2010), Magnus (2019), Cundari et al. and Piispa et al., respectively.Location maps are a great way to get an overview of any area, whether you’re planning a trip or researching a new business venture. With the right tools, you can easily create your own free location map and get started today. Here’s how:EAS 131 Oceans and Our Global Environment (IU, Associate Instructor) EAS 225 Earth Materials (IU, Associate Instructor) GEOL 188 Advanced Geologic Mapping (Sacramento State, TA)Large igneous provinces, or LIPs, are huge pools of volcanic rocks poured out at the Earth’s surface. The Midcontinent Rift is both of these -- like a hybrid animal.”. “Geologists call it a rift because it’s long and narrow,” explained Seth Stein, a co-author of the study, “but it’s got much more volcanic rock inside it than any ...Geologic map and cross section of part of the North American Midcontinent Rift. (A) Regional map showing location of the Grenville Front relative to the study area.June 4, 2020 Geophysical Mapping of Geologic Systems Host to Critical Mineral Deposits, Southern Midcontinent, USFigure 1. (A) Gravity map showing Midcontinent Rift (MCR), and its extensions, the Fort Wayne Rift (FWR) and East Continent Gravity High (ECGH), computed by upward continuing complete Bouguer anomaly (CBA) data to 40 km and subtracting result from CBA (Stein et al., 2014). (B) Bouguer gravity data and model across the MCR, showing …Aug 20, 2020 · The Midcontinent Rift system and surrounding Precambrian rocks are known to host highly significant mineral resources. Our project objectives are to increase understanding of this system through the integration of new and legacy geophysical data with geochemical and borehole data, map the lithology and structure of PreCambrian rocks, and develop an integrated 3D geologic model of the region. June 4, 2020 Geophysical Mapping of Geologic Systems Host to Critical Mineral Deposits, Southern Midcontinent, USThe Midcontinent Rift system and surrounding Precambrian rocks are known to host highly significant mineral resources. Our project objectives are to increase understanding of this system through the integration of new and legacy geophysical data with geochemical and borehole data, map the lithology and structure of PreCambrian rocks, and develop an integrated 3D geologic model of the region.The Midcontinent Rift was discovered by geophysicists who noticed that gravity was stronger in some parts of the upper Midwest than in others. In the 1950s and 1960s, they mapped the gravity and ...“Bouguer Gravity Anomaly Map of Iowa” I6 I5. Major features of the Midcontinent Rift System in Iowa displayed on a modified version of the “Aeromagnetic Anomaly Map of Iowa” I8 I6. Locations of Petty-Ray Geosource, Inc., reflection seismic profiles on a map of major features of the Midcontinent Rift System in Iowa I9 I7–I8.1 Introduction. The shallow, dense igneous rocks of North America's 1.1-Ga failed Midcontinent Rift (MCR) System create a striking magnetic anomaly and gravity high that demarcate the rift axis (Chase & Gilmer, 1973; Hinze et al., 1992; King & Zietz, 1971).The system consists of two arms that converge in the Lake Superior region—one …One of the most prominent features on gravity and magnetic maps of North America is the Midcontinent Rift (MCR), an extensive band of buried igneous and sedimentary rocks that outcrop around Lake Superior ().To the south, the rift is deeply buried by younger sediments, but its two arms are easily traced because the igneous rocks are dense and highly magnetized (King and Zietz, 1971; Hinze et ...Figure 1. (A) Bouguer gravity anomaly map for central North America. Anomalies related to the Midcontinent Rift (MCR), Southern Oklahoma Aulacogen (SOA), and Reelfoot Rift (RR) are outlined. Dashed lines outline possible extensions of rift arms not included in analysis. (B) Profiles used in calculating the average gravity anomalies. Mar 1, 2018 · The Keweenawan Midcontinent rift system was imposed upon the terrane suture in our study area at ca. 1100 Ma. This event nearly separated the ancient continent and imparted enormous volumes of mafic magma to various depths in the crust (Hinze et al., 1997; Nicholson et al., 1997; Vervoort et al., 2007; Stein et al., 2015), engendering numerous high-grade base and precious metal deposits ... Two prominent Precambrian features of central North America (Fig. 1) record opposite ends of the Wilson cycle.One, the Midcontinent Rift (MCR), is a 3000-km long horseshoe-shaped band of more than 2 million km 3 of buried igneous and sedimentary rocks that outcrop near Lake Superior (Ojakangas et al., 2001; S. Stein et al., 2018).To …Fig. 1. (a) Gravity map showing the Midcontinent Rift (MCR). The west arm extends southward from Lake Superior at least to Oklahoma along the Southern Oklahoma Aulacogen (SOA).
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a) Regional map showing location of magmatic rocks associated with the 1.1 Ga Midcontinent Rift (grey). b) Map showing location of Midcontinent Rift volcanic rocks (black fields) in the Lake Superior region. c) Generalized stratigraphic section of Mamainse Point volcanic rocks.16 ก.ย. 2563 ... Looking at a map, it's not obvious that what's now. North America ... Midcontinent Rift stopped, and all that compression happened much later.Abstract. Recent drilling of the midcontinent rift system in northeastern Kansas reveals a transposed Keweenawan stratigraphy of mafic volcanic rocks overlying thick elastic sedimentary rocks. A reprocessed version of COCORP Kansas Line 1 indicates that the drillhole penetrated a series of west-dipping reflectors associated with a reverse fault ...The USGS has just released a new interactive Story Map describing the Mineral Deposits of the Midcontinent Rift System. The Midcontinent Rift System, which curves for more than 2000 km across the Upper Midwest, is one of the world’s great continental rifts.features as due to an incipient rift system goes back many years (e.g. Lyons 1959, King & Zietz 1971), and these features have been referred to as the "central North American rift system" (Ocola & Meyer 1973) or, more simply, the "midcontinent rift system" (Wold & Hinze 1982). In this reviewJan 1, 1992 · The 1.1 Ga Midcontinent rift system of North America is one of the world's major continental rifts and hosts a variety of mineral deposits. The rocks and mineral deposits of this 2000 km long rift are exposed only in the Lake Superior region. Nov 1, 2020 · The Midcontinent Rift System (MRS) of North America represents a major thermal-tectonic rifting event ca. 1.1 Ga marked by a huge volume of igneous rock emplaced in a relatively short time span of ~30 million years, followed by deposition of a thick package of clastic sediments with subsequent faulting (Wold and Hinze, 1982). Fig. 1. (a) Gravity map showing the Midcontinent Rift (MCR). The west arm extends southward from Lake Superior at least to Oklahoma along the Southern Oklahoma Aulacogen (SOA).Magmatism during the 1.1 Ga old Midcontinent Rift (MCR) event is associated with the origin of several metallic mineral deposits in the Great Lakes region of North America [1] [2] [3][4][5].The volcanic rocks are remnants of what is called the Midcontinent Rift, and it is an enormous geological puzzle. Rifts are wounds in Earth's outer layer that can grow to eventually form new oceans.The ocean floor is a landscape shaped by volcanoes, rift valleys and submerged mountain ranges, but most of the floor is covered in thick, featureless sediment layers. These areas are called the abyssal plains.The Midcontinent Rift caused a nearly 1,300-mile horseshoe-shaped gash from Lake Superior west to ... National Geographic’s Trails Illustrated maps highlight the best places for hiking ...Nov 1, 2016 · Failed rifting of the North American craton in the Mesoproterozoic left the Midcontinent Rift system (Stein et al., 2016, Van Schmus and Hinze, 1985), and disintegration of the Rodinia supercontinent in the Neoprotozoic left the Reelfoot rift and other rift systems near the eastern margin of the North American continent (Johnston and Kanter ... The Midcontinent Rift System (MRS) of North America is one of the world’s largest continental rifts and has an age of 1.1 Ga (giga-annum). The MRS hosts a diverse suite of magmatic and hydrothermal mineral deposits in the Lake Superior region where rift rocks are exposed at or near the surface. As part of the construction of a database …a) Regional map showing location of magmatic rocks associated with the 1.1 Ga Midcontinent Rift (grey). b) Map showing location of Midcontinent Rift volcanic rocks (black fields) in the Lake Superior region. c) Generalized stratigraphic section of Mamainse Point volcanic rocks..
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