Geology of the Three Forks quadrangle, Montana / by G.D. Robinson ; with sections on petrography of igneous rocks, by H. Frank Barnett.
| Author/creator | Robinson, G. D., 1918- |
| Other author | Barnett, H. Frank, 1921- contributor. |
| Other author | Geological Survey (U.S.) |
| Format | Map |
| Publication | [Washington D.C.] : U.S. Geological Survey, 1963. |
| Manufacture | Washington [D.C.] : U.S. Government Printing Office |
| Description | iv, 143 pages, 4 unnumbered folded leaves of plates (in pocket) : illustrations, maps (2 color), diagrams, tables ; 29 cm. |
| Supplemental Content | https://doi.org/10.3133/pp370 |
| Subjects |
| Cartographic data | Scale 1:48,000 (W 111°45ʹ--W 111°30ʹ/N 46°00ʹ--N 45°54ʹ). |
| Cartographic data | Scale 1:96,000 (W 111°45ʹ--W 111°30ʹ/N 46°00ʹ--N 45°54ʹ). |
| Series | Geological Survey (U.S.). Professional paper ; 370 Geological Survey professional paper ; 370. ^A16492 |
| Contents | Abstract -- Introduction -- Previous work -- Acknowledgments -- Geography -- Terrain -- Flora and fauna -- Climate -- History and settlements -- Travel -- Precambrian metamorphic rocks -- Gneiss and amphibolite -- Hematitic phyllonite -- Origin -- Age -- Regional relations -- Sedimentary rocks -- Precambrian-Belt series -- North Boulder formation -- Paleozoic -- Cambrian -- Names and correlations of Cambrian formations -- Flathead sandstone -- Wolsey shale -- Meagher limestone -- Park shale -- Pilgrim limestone -- Devonian and Lower Mississippian -- Maywood formation -- Jefferson dolomite -- Three Forks shale -- Carboniferous -- Names and general correlation of Carboniferous formations -- Madison group -- Lodgepole limestone -- Mission Canyon limestone -- Big Snowy formation -- Amsden formation -- Quadrant formation -- Permian -- Phosphoria formation -- Mesozoic -- Jurassic -- Ellis formation -- Morrison formation -- Cretaceous -- Kootenai formation -- Cenozoic -- Tertiary -- Bozeman group -- Names and correlation of units -- Sphinx conglomerate -- Milligan Creek formation -- Climbing Arrow formation -- Dunbar Creek formation -- Middle and upper Tertiary gravel -- Quaternary -- Old alluvium -- Rounded gravel -- Subrounded gravel -- Origin of old alluvium -- Fan gravel -- Silt -- Young alluvium -- Age and stratigraphic relations of Quaternary deposits -- Igneous rocks -- Upper Cretaceous and lower Tertiary -- Extrusive rocks -- Elkhorn Mountains volcanics -- Petrography / H. Frank Barnett -- Andesite -- Porphyritic perlite -- Correlation and age -- Intrusive rocks -- Quartz monzonite and related rocks -- 10N pluton -- Thick sill west of Spring Creek -- Petrography / H. Frank Barnett -- Age -- Latite -- Pluglike bodies -- Thick sills -- Thin sills -- Petrography / H. Frank Barnett -- Age -- Andesite -- Sills south of Milligan Canyon -- Intrusive rocks north of Milligan Canyon -- Petrography / H. Frank Barnett -- Age -- Summary of age relations -- Igneous rocks intrusive into Tertiary rocks -- Olivine basalt -- Petrography / H. Frank Barnett -- Age -- Some petrologic relations -- Structure -- Summary of structural history -- Structure of Precambrian crystalline rocks -- Structural significance of Precambrian sedimentary rocks -- Laramide structural features -- Early folding -- Steep faults older than thrusting -- Thrust faults -- Sixteenmile thrust zone -- Lombard thrust -- Highway thrust -- Jefferson Canyon thrust -- Minor thrusts -- Thrust displacement -- Time relations of folding and thrusting -- Steep faults in upper plate of Highway thrust -- Other steep faults closely related to thrusting -- Steep faults younger than thrusting -- Origin of Cenozoic basin -- Post-Laramide structural features -- Geomorphology -- Hills -- Benches -- Streams -- Origin of benched terrain -- Geologic history -- Economic geology -- Construction materials -- Glass sand -- Mica -- Phosphate rock -- Iron and manganese -- Copper -- Outlook for future discoveries of ore deposits -- Petroleum possibilities -- Measured sections in pre-Tertiary rocks -- Section A -- Section B -- Section C -- Section D -- References -- Index. |
| Contents | Plate 1. Geologic map and sections of the Three Forks quadrangle, Montana -- Plate 2. Data map, Three Forks quadrangle, Montana -- Plate 3. Structural diagram, Three Forks quadrangle, Montana. |
| Abstract | A comprehensive restudy of a classic area of Rocky Mountain geology at the head of the Missouri River. |
| Local note | Joyner- FOR JOYNER LIBRARY HOLDINGS OF THE SERIES, GEOLOGICAL SURVEY PROFESSIONAL PAPER, SEARCH BY CALL NUMBER QE75 .P9. |
| Bibliography note | Includes bibliographical references (pages 135-140) and index. |
| Other forms | Also available via the World Wide Web. |
| Issued in other form | Online version: Robinson, G.D. (Gershon Du Vall), 1918-. Geology of the Three Forks quadrangle, Montana |
| Genre/form | geological maps. |
| Genre/form | quadrangle maps. |
| Genre/form | Quadrangle maps. |
| Genre/form | Maps. |
| Genre/form | Geological maps. |
| Genre/form | Geological maps. |
| Genre/form | Quadrangle maps. |
| Genre/form | Cartes géologiques. |
| Genre/form | Coupures cartographiques. |
| Other title | Geologic map and sections of the Three Forks quadrangle, Montana. |
| Other title | Data map, Three Forks quadrangle, Montana. |
| Other title | Structural diagram, Three Forks quadrangle, Montana. |
| Other title | Three Forks quadrangle, Montana. |
| LCCN | gs 63000240 |
| Govt. docs number | I 19.16:370 |