A geochemical survey was conducted in the Mount Henry Roadless Area, Kootenai National Forest, Lincoln County, Mont. by the U.S. Geological Survey during the summer of 1981.
\nThe sampling and analytical programs were designed to locate mineralized zones in outcrops or in rocks buried at shallow depth. The geochemical results should be evaluated in context with geological and geophysical results. Possible types of mineralization, as judged from occurrences in nearby areas where the rocks are similar to those in the study area, include strata-bound copper-silver occurrences in rocks of the Ravalli Group, specifically the Burke and Revett Formations; the less probable lead-zinc massive sulfide deposits of the Sullivan-type in the pre-Ravalli (middle Prichard Formation); potential metal-enriched, sulfide vein systems; and gold-bearing veins or placer occurrences.
\nAll samples collected for this study are plotted on the map. Element symbols shown at sample sites indicate an anomalous concentration for that element at the site. Tables 1–3 list the values of selected elements determined to be critical for a mineral evaluation of this particular geologic setting. All analytical results, including those selected for this report, are given in a U.S. Geological Survey Open-File report (Siems and others, 1983).
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F.","contributorId":101239,"corporation":false,"usgs":true,"family":"Siems","given":"D.","email":"","middleInitial":"F.","affiliations":[],"preferred":false,"id":260712,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Leinz, R. W.","contributorId":89885,"corporation":false,"usgs":true,"family":"Leinz","given":"R.","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":260709,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Van Loenen, R. E.","contributorId":99130,"corporation":false,"usgs":true,"family":"Van Loenen","given":"R.","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":260710,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Wadsworth, G.A.","contributorId":99431,"corporation":false,"usgs":true,"family":"Wadsworth","given":"G.A.","email":"","affiliations":[],"preferred":false,"id":260711,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"McDougal, C. 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1984 - Geologic map of the Wisdom Quadrangle, Beaverhead County, Montana","interactions":[],"lastModifiedDate":"2012-02-10T00:10:16","indexId":"mf1695","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1984","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":325,"text":"Miscellaneous Field Studies Map","code":"MF","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"1695","title":"Geologic map of the Wisdom Quadrangle, Beaverhead County, Montana","language":"ENGLISH","doi":"10.3133/mf1695","usgsCitation":"Hanneman, D., 1984, Geologic map of the Wisdom Quadrangle, Beaverhead County, Montana: U.S. Geological Survey Miscellaneous Field Studies Map 1695, 1 map ;58 x 41 cm., on sheet 69 x 61 cm., folded in envelope 25 x 32 cm., https://doi.org/10.3133/mf1695.","productDescription":"1 map ;58 x 41 cm., on sheet 69 x 61 cm., folded in envelope 25 x 32 cm.","costCenters":[],"links":[{"id":106099,"rank":700,"type":{"id":15,"text":"Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_7515.htm","linkFileType":{"id":5,"text":"html"},"description":"7515"},{"id":184478,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/usgs_thumb.jpg"}],"scale":"0","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -113.5,45.5 ], [ -113.5,45.6175 ], [ -113.36749999999999,45.6175 ], [ -113.36749999999999,45.5 ], [ -113.5,45.5 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4ae4e4b07f02db689923","contributors":{"authors":[{"text":"Hanneman, D.L.","contributorId":49454,"corporation":false,"usgs":true,"family":"Hanneman","given":"D.L.","email":"","affiliations":[],"preferred":false,"id":262408,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":60163,"text":"mf1707 - 1984 - Photogeologic and reconnaissance geologic map of the Whitney Creek Quadrangle, Custer County, Montana","interactions":[],"lastModifiedDate":"2012-02-10T00:10:20","indexId":"mf1707","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1984","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":325,"text":"Miscellaneous Field Studies Map","code":"MF","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"1707","title":"Photogeologic and reconnaissance geologic map of the Whitney Creek Quadrangle, Custer County, Montana","language":"ENGLISH","doi":"10.3133/mf1707","usgsCitation":"Luft, S.J., Colton, R.B., and Heffern, E., 1984, Photogeologic and reconnaissance geologic map of the Whitney Creek Quadrangle, Custer County, Montana: U.S. Geological Survey Miscellaneous Field Studies Map 1707, 1 map ;58 x 40 cm., on sheet 71 x 76 cm., folded in envelope 25 x 32 cm., https://doi.org/10.3133/mf1707.","productDescription":"1 map ;58 x 40 cm., on sheet 71 x 76 cm., folded in envelope 25 x 32 cm.","costCenters":[],"links":[{"id":106242,"rank":700,"type":{"id":15,"text":"Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_7756.htm","linkFileType":{"id":5,"text":"html"},"description":"7756"},{"id":183301,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/usgs_thumb.jpg"}],"scale":"0","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -105.75,46.25 ], [ -105.75,46.3675 ], [ -105.61749999999999,46.3675 ], [ -105.61749999999999,46.25 ], [ -105.75,46.25 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4adce4b07f02db686601","contributors":{"authors":[{"text":"Luft, S. 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These characteristics are important to scientists and engineers who study the surface faulting and earthquakes and should also be helpful to those concerned with land use and development on or near faults in swetern Surprose Valley. In addition, faults apparently control the location of modern geothermal activity in Surprise Valley (Hedel, 1981) and are thus important to geothermal exploration.
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Regional metamorphism prior to Cambrian time prograded the Belt rocks to greenschist facies, and some metal-bearing veins were emplaced in fractures. The Belt rocks were intruded in Late Proterozoic time by basic dikes and sills.
","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/mf1354G","usgsCitation":"Marvin, R.F., Zartman, R., Obradovich, J.D., and Harrison, J.E., 1984, Geochronometric and lead isotope data on samples from the Wallace 1 degree by 2 degrees Quadrangle, Montana and Idaho: U.S. Geological Survey Miscellaneous Field Studies Map 1354, 31.43 x 41.26 inches, https://doi.org/10.3133/mf1354G.","productDescription":"31.43 x 41.26 inches","costCenters":[],"links":[{"id":358790,"rank":2,"type":{"id":17,"text":"Plate"},"url":"https://pubs.usgs.gov/mf/1354-G/plate-1.pdf","linkFileType":{"id":1,"text":"pdf"}},{"id":184545,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/mf/1354-G/report-thumb.jpg"}],"scale":"250000","country":"United States","state":"Idaho, Montana","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -116,47 ], [ -116,48 ], [ -114,48 ], [ -114,47 ], [ -116,47 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b1de4b07f02db6a9dc0","contributors":{"authors":[{"text":"Marvin, R. 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The study area contains 46,150 acres of land administered by the by the Bureau of Land Management and 1 sq mi owned by the State of Idaho, a total of 46,790 acres. Most of the study area is readily accessible by roads along tributaries of the East Fork Salmon River, especially Road Creek, Herd Creek, and Lake Creek. The southeastern part of the area can be reached from Road Creek by the road down Peck's Canyon and by roads from Thousand Springs Valley, southeast of the study area. Several access roads to past logging operations extend up Sage Creek and its tributaries in the southeast part of the study area. Access to points within the northern part of the area is facilitated by jeep trails that connect with Road Creek and lake Creek and by improved road that extends northward from Herd Lake. The study area is moderately rugged, with local relief approaching 2,000 ft. Jerry (10,010 ft), the highest point within the area, is a low knoll on a north-trending linear ridge (fig. 1). 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B.","contributorId":40186,"corporation":false,"usgs":true,"family":"Colton","given":"R.","email":"","middleInitial":"B.","affiliations":[],"preferred":false,"id":263224,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Heffern, E.L.","contributorId":76400,"corporation":false,"usgs":true,"family":"Heffern","given":"E.L.","email":"","affiliations":[],"preferred":false,"id":263225,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":60158,"text":"mf1683 - 1984 - Photogeologic and reconnaissance geologic map of the Paddy Fay Creek Quadrangle, Custer County, Montana","interactions":[],"lastModifiedDate":"2012-02-10T00:10:18","indexId":"mf1683","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1984","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":325,"text":"Miscellaneous Field Studies Map","code":"MF","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"1683","title":"Photogeologic and reconnaissance geologic map of the Paddy Fay Creek Quadrangle, Custer County, Montana","language":"ENGLISH","doi":"10.3133/mf1683","usgsCitation":"Luft, S.J., and Colton, R.B., 1984, Photogeologic and reconnaissance geologic map of the Paddy Fay Creek Quadrangle, Custer County, Montana: U.S. Geological Survey Miscellaneous Field Studies Map 1683, 1 map ;58 x 40 cm., on sheet 68 x 75 cm., folded in envelope 25 x 32 cm., https://doi.org/10.3133/mf1683.","productDescription":"1 map ;58 x 40 cm., on sheet 68 x 75 cm., folded in envelope 25 x 32 cm.","costCenters":[],"links":[{"id":106237,"rank":700,"type":{"id":15,"text":"Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_7751.htm","linkFileType":{"id":5,"text":"html"},"description":"7751"},{"id":183187,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/usgs_thumb.jpg"}],"scale":"0","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -105.86749999999999,46.25 ], [ -105.86749999999999,46.3675 ], [ -105.75,46.3675 ], [ -105.75,46.25 ], [ -105.86749999999999,46.25 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4adce4b07f02db686495","contributors":{"authors":[{"text":"Luft, S. J.","contributorId":95127,"corporation":false,"usgs":true,"family":"Luft","given":"S.","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":263238,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Colton, R. B.","contributorId":40186,"corporation":false,"usgs":true,"family":"Colton","given":"R.","email":"","middleInitial":"B.","affiliations":[],"preferred":false,"id":263237,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":58994,"text":"mf1535B - 1984 - Geologic map of the Sweetwater Roadless Area, Mono County, California, and Lyon and Douglas counties, Nevada","interactions":[],"lastModifiedDate":"2012-02-10T00:10:16","indexId":"mf1535B","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1984","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":325,"text":"Miscellaneous Field Studies Map","code":"MF","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"1535","chapter":"B","title":"Geologic map of the Sweetwater Roadless Area, Mono County, California, and Lyon and Douglas counties, Nevada","language":"ENGLISH","doi":"10.3133/mf1535B","usgsCitation":"Brem, G.F., 1984, Geologic map of the Sweetwater Roadless Area, Mono County, California, and Lyon and Douglas counties, Nevada: U.S. Geological Survey Miscellaneous Field Studies Map 1535, 1 map ;74 x 58 cm., on sheet 100 x 146 cm., folded in envelope 25 x 32 cm., https://doi.org/10.3133/mf1535B.","productDescription":"1 map ;74 x 58 cm., on sheet 100 x 146 cm., folded in envelope 25 x 32 cm.","costCenters":[],"links":[{"id":106090,"rank":700,"type":{"id":15,"text":"Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_7506.htm","linkFileType":{"id":5,"text":"html"},"description":"7506"},{"id":184270,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/usgs_thumb.jpg"}],"scale":"0","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -119.5,38.25 ], [ -119.5,38.666666666666664 ], [ -119.15,38.666666666666664 ], [ -119.15,38.25 ], [ -119.5,38.25 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4ae5e4b07f02db68a4fd","contributors":{"authors":[{"text":"Brem, G. F.","contributorId":94276,"corporation":false,"usgs":true,"family":"Brem","given":"G.","email":"","middleInitial":"F.","affiliations":[],"preferred":false,"id":261240,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":59768,"text":"mf1713 - 1984 - Types of damage that could result from a great earthquake in the New Madrid, Missouri, seismic zone","interactions":[],"lastModifiedDate":"2026-02-23T21:30:35.522784","indexId":"mf1713","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1984","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":325,"text":"Miscellaneous Field Studies Map","code":"MF","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"1713","title":"Types of damage that could result from a great earthquake in the New Madrid, Missouri, seismic zone","docAbstract":"In the winter of 1811–1812 a series of three great earthquakes occurred in the New Madrid seismic zone. In addition to the three principal shocks, at least 15 other earthquakes, Io ≥ VIII, occurred within a year of the first large earthquake on December 16, 1811. The three main shocks were felt over the entire eastern United States. They were strong enough to cause minor damage as far away as Indiana and Ohio on the north, the Carolinas on the east, and southern Mississippi on the south. They were strong enough to cause severe or structural damage in parts of Missouri, Illinois, Indiana, Kentucky, Tennessee, Mississippi, and Arkansas. The section of this poster titled \"Seismic history of the New Madrid region\" describes what happened in the epicentral region. Fortunately, few people lived in the severely shaken area in 1811; that is not the case today. What would happen if a series of earthquakes as large and numerous as the \"New Madrid\" earthquakes were to occur in the New Madrid seismic zone today?
\nPhotographs 1-10 show typical damage to structures that occurred during various earthquakes in the United States. Structural damage to buildings in the Modified Mercalli intensity scale, a scale used for assigning numbers to earthquake effects, begins at intensity VIII. Minor or architectural damage (cracked plaster, windows, and chimneys) occurs at intensities VI and VII, and effects on people and small objects predominate at intensities below VI (earthquake felt, direction and duration noted, dishes broken). Photographs 1-10 illustrate damage caused by intensity VIII and above. None of the damage shown in these photographs occurred in earthquakes larger than the 1811–1812 New Madrid shocks, and most of the examples are from considerably smaller shocks. Photographs 1-4 and 7 show damage to masonry buildings, mostly old and unreinforced, none designed to be earthquake resistant. How many such buildings are in use in your community? Photographs 5 and 6 show damage to modern structures close to the epicenter of a magnitude 6.5 earthquake, a small shock compared to the magnitudes (8.4–8.7) of the New Madrid earthquakes. Photographs 8–10 are typical of damage that can occur at large distances from great earthquakes. Tall buildings are particularly susceptible to ground motions with relatively long periods (greater than 1 second), while short, rigid buildings are generally more likely to be damaged by ground motions with periods of less than 1 second. Shorter period ground motions attenuate more rapidly with distance from the epicenter than do the longer period motions.
\nThe 1811-1812 earthquakes produced extensive ground effects. Earthquakes can cause many different kinds of ground effects, ranging from minor fissures, slumps, and rockslides to major landslides and disturbances of the ground surface. Photographs 1117 show typical earthquake ground effects and the kinds of damage they can cause to manmade structures.
\nIs another earthquake as large as the 1811-1812 shocks really likely to occur in New Madrid seismic zone? Great earthquakes such as the 1811-1812 series are estimated to occur in the zone on the average every 500 years. However, earthquakes strong enough to cause structural damage (VIII in the Modified Mercalli intensity scale) are estimated to occur in the seismic zone on the average every 50 years. The last such shock occurred in 1843.
\nHow do you prepare for a possible earthquake and what do you do if one occurs? The section on \"Earthquake safety tips\" explains what to do before, during, and after an earthquake.
\nWant to know more? See \"Sources of additional information.\" Other reports of interest are listed in \"References cited.\"
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