DOCSLIB.ORG

Synthesis of Petrographic, Geochemical, and Isotopic Data for the Boulder Batholith, Southwest Montana

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Synthesis of Petrographic, Geochemical, and Isotopic Data for the Boulder Batholith, Southwest Montana Synthesis of Petrographic, Geochemical, and Isotopic Data for the Boulder Batholith, Southwest Montana Professional Paper 1793 U.S. Department of the Interior U.S. Geological Survey Cover photograph: Planar jointed, spheroidal weathered Butte Granite at Homestake Pass, Montana. Synthesis of Petrographic, Geochemical, and Isotopic Data for the Boulder Batholith, Southwest Montana By Edward A. du Bray, John N. Aleinikoff, and Karen Lund Professional Paper 1793 U.S. Department of the Interior U.S. Geological Survey U.S. Department of the Interior KEN SALAZAR, Secretary U.S. Geological Survey Marcia K. McNutt, Director U.S. Geological Survey, Reston, Virginia: 2012 For more information on the USGS—the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment, visit http://www.usgs.gov or call 1–888–ASK–USGS. For an overview of USGS information products, including maps, imagery, and publications, visit http://www.usgs.gov/pubprod To order this and other USGS information products, visit http://store.usgs.gov Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner. Suggested citation: du Bray, E.A., Aleinikoff, J.N., and Lund, Karen, 2012, Synthesis of petrographic, geochemical, and isotopic data for the Boulder batholith, southwest Montana: U.S. Geological Survey Professional Paper 1793, 39 p. iii Contents Abstract ...........................................................................................................................................................1 Introduction.....................................................................................................................................................1 Study Description...........................................................................................................................................4 Petrographic Data..........................................................................................................................................5 Major Oxide Data ...........................................................................................................................................9 Mafic Group ...........................................................................................................................................9 Intermediate Group...............................................................................................................................9 Felsic Group ...........................................................................................................................................9 Trace Element Data .....................................................................................................................................12 Mafic Group .........................................................................................................................................12 Intermediate Group.............................................................................................................................12 Felsic Group .........................................................................................................................................12 U-Pb Zircon Geochronology.......................................................................................................................17 Methods................................................................................................................................................17 Results ..................................................................................................................................................18 Radiogenic Isotope Data ............................................................................................................................20 Petrogenetic Implications of Geochemical and Isotopic Data ............................................................20 Conclusions...................................................................................................................................................35 Acknowledgments .......................................................................................................................................35 References Cited..........................................................................................................................................35 Figures 1. Index map showing location of Boulder batholith relative to major geologic features in the region ..................................................................................................2 2. Map showing the Boulder batholith, southwest Montana ....................................................3 3. Quartz-alkali feldspar-plagioclase ternary diagrams showing modal compositions of Boulder batholith plutons ...............................................................................7 4. Variation diagrams showing major oxide abundances in samples of the Boulder batholith, southwest Montana ............................................................................11 5. Total alkali-silica variation diagram showing compositions of the Boulder batholith, southwest Montana ..................................................................................13 6. FeO*/(FeO*+MgO) versus SiO2 variation diagram showing compositions the Boulder batholith, southwest Montana ............................................................................14 7. Na2O+K2O-CaO versus SiO2 variation diagram showing compositions of the Boulder batholith southwest Montana ........................................................................15 8. Variation diagram showing molar major oxide compositions of the Boulder batholith, southwest Montana as a function of alumina and alkali saturation ................16 9. Trace-element, tectonic-setting-discrimination variation diagram showing the composition of the Boulder batholith, southwest Montana .........................................18 10. Variation diagram showing relative proportions of rubidium, potassium, and strontium in samples of the Boulder batholith, and its peripheral plutons, southwest Montana ...................................................................................................................19 iv 11. Chondrite-normalized rare-earth element diagrams for Boulder batholith samples ........................................................................................................................................21 12. Primitive mantle-normalized trace-element diagrams for Boulder batholith samples ........................................................................................................................22 13. Photographs of representative zircons and Tera-Wasserburg plots of sensitive high-resolution ion microprobe (SHRIMP) U-Pb dates from each sample dated in this study .........................................................................................................23 14. Graph showing epsilon neodymium versus initial strontium isotopic data for Boulder batholith samples ..................................................................................................33 Tables 1. Summary of petrographic characteristics for plutons of the Boulder batholith, southwest Montana ....................................................................................................6 2. Average mineralogic and chemical compositions of Butte Granite north and south of latitude 46.2°N. Boulder batholith, southwest Montana ......................9 3. Average chemical compositions for plutons of the Boulder batholith, southwest Montana, arranged in order of increasing silica content ................................10 4. SHRIMP U-Th-Pb data for zircon from plutons of Boulder batholith, southwest Montana ...................................................................................................................27 5. Summary of age data for plutons of Boulder batholith, southwest Montana. .................33 6. Rb-Sr and Sm-Nd isotopic data for samples of the Boulder batholith, southwest Montana ...................................................................................................................34 Appendix 1. Petrographic and geochemical data for samples of the Boulder batholith, southwest Montana ............................................................................................... link Synthesis of Petrographic, Geochemical, and Isotopic Data for the Boulder Batholith, Southwest Montana By Edward A. du Bray, John N. Aleinikoff, and Karen Lund Abstract the plutons is also characterized by distinct trace element abun- dances although absolute trace element abundance variations are relatively minor. Limited Sr and Nd isotope data for whole- The Late Cretaceous Boulder batholith in southwest rock samples of the Boulder batholith are more radiogenic Montana consists of the Butte Granite and a group of associ- than those for plutonic rocks of western Idaho, eastern Oregon, ated smaller intrusions emplaced into Mesoproterozoic to the Salmon River suture, and most of the Big Belt Mountains. Mesozoic sedimentary rocks and into the Late Cretaceous Elk- Initial strontium
Load more

Recommended publications
  • RECREATION GUIDE 2021 1 Your BUTTE FAMILY IS IMPORTANT to Our BUTTE FAMILY
    2021 Kids Summer Fun Events Pg.27 Pg.8-9 Brought to you by BUTTE RECREATION GUIDE 2021 1 Your BUTTE FAMILY IS IMPORTANT TO our BUTTE FAMILY townpump.com 2 BUTTE RECREATION GUIDE 2021 BUTTE RECREATION GUIDE 2021 3 OUR MISSION e Butte-Silver Bow Parks and Recreation Department is committed to improving our community’s health, stability, beauty, and quality of life by providing outstanding parks, trails, recreational facilities and leisure opportunities for all of our citizens. Butte-Silver Bow Parks & Recreation at a glance: • More than two dozen parks (many with pavilions that can be reserved), numerous playgrounds, a 9 hole regulation golf course, a par-3 golf course, a clubhouse with golf simulators, two disc golf courses, a splash pad, and a wading pool • Ridge Waters: A family water park featuring two water slides, a lazy river, a zero depth entry children’s area, a climbing wall, a diving board, swimming lanes, rentable cabanas, and a concession stand • A new destination playground at Stodden Park • An extensive urban and rural trail system • ompson Park: e only dually managed municipal/National Forest Service park in the nation • Adult and youth programming, which include: volleyball, softball and pickleball and more • Two historic mine yards that are now event facilities • Community-wide special events CONTENTS Parks & Recreation Fast Facts…Page 6 Butte Arborist…Page 7 Ridge Waters…Page 8 We’re on the web! Stodden Park…Page 10 butteparksandrec.com ridgewaters.com Popular Urban Parks…Page 11 highlandviewgolf.com Recreational Facilities…Page 16 Find us on Facebook, Twitter and Instagram! Mine Yards…Page 18 Rural Parks & Recreation Near Butte…Page 20 Thompson Park Map…Page 22 Butte Urban Map…Page 23 @ButteParks @ButteSilverBow @ButteParksandRec Highland View Golf Course…Page 25 Summer Fun Youth Events…Page 27 Regional Outdoor Opportunities… On the cover: Page 29 Cyclist in Thompson Park.
    [Show full text]
  • Porphyry and Other Molybdenum Deposits of Idaho and Montana
    Porphyry and Other Molybdenum Deposits of Idaho and Montana Joseph E. Worthington Idaho Geological Survey University of Idaho Technical Report 07-3 Moscow, Idaho ISBN 1-55765-515-4 CONTENTS Introduction ................................................................................................ 1 Molybdenum Vein Deposits ...................................................................... 2 Tertiary Molybdenum Deposits ................................................................. 2 Little Falls—1 ............................................................................. 3 CUMO—2 .................................................................................. 3 Red Mountain Prospect—45 ...................................................... 3 Rocky Bar District—43 .............................................................. 3 West Eight Mile—37 .................................................................. 3 Devil’s Creek Prospect—46 ....................................................... 3 Walton—8 .................................................................................. 4 Ima—3 ........................................................................................ 4 Liver Peak (a.k.a. Goat Creek)—4 ............................................. 4 Bald Butte—5 ............................................................................. 5 Big Ben—6 ................................................................................. 6 Emigrant Gulch—7 ...................................................................
    [Show full text]
  • Petrogenesis of Highly Fractionated I-Type Peraluminous Granites: La Pedriza Pluton (Spanish Central System)
    View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by EPrints Complutense Geologica Acta, Vol.8, Nº 2, June 2010, 131-149 DOI: 10.1344/105.000001527 Available online at www.geologica-acta.com Petrogenesis of highly fractionated I-type peraluminous granites: La Pedriza pluton (Spanish Central System) 1 1 CECILIA PÉREZ-SOBA and CARLOS VILLASECA 1 Department of Petrology and Geochemistry, Universidad Complutense de Madrid- Instituto de Geología Económica (C.S.I.C.) c/ José Antonio Novais, 2, 28040 Madrid, Spain. Pérez-Soba E.mail: [email protected] ABSTRACT The La Pedriza pluton stands out as the most extensively fractionated granite (Rb < 629; Sr < 2 and Ba < 2 ppm) of the Spanish Central System Batholith. These granites show a strong enrichment in some rare metal contents (Nb = 44, Y = 136, Yb = 10.7, U = 17, Ta = 7, Sc = 15 ppm). The petrography and geochemistry (including Sr- Nd isotopes) reveal that the pluton is composed of at least four units. These are classified as I-type peraluminous leucogranites (A/CNK=1.03-1.17), P-poor (P2O5<0.2 wt%) and Na2O-rich (< 4.24 wt%) exhibiting differences in their HFSE and REE contents and εNd compositions. Moreover, the units of the La Pedriza granite display different trends of fractional crystallization. REE spectra of the two most fractionated units suggest the involvement of a fluorine-rich melt in the last stages favouring the crystallization of xenotime and niobotantalates. Intermediate meta-igneous granulite protoliths are proposed as source rocks. The most evolved units of the La Pedriza pluton show chemical features convergent to A-type granites; these are explained by extensive fractional crystallization of a P-poor, I-type granite magma.
    [Show full text]
  • Characterization of Ecoregions of Idaho
    1 0 . C o l u m b i a P l a t e a u 1 3 . C e n t r a l B a s i n a n d R a n g e Ecoregion 10 is an arid grassland and sagebrush steppe that is surrounded by moister, predominantly forested, mountainous ecoregions. It is Ecoregion 13 is internally-drained and composed of north-trending, fault-block ranges and intervening, drier basins. It is vast and includes parts underlain by thick basalt. In the east, where precipitation is greater, deep loess soils have been extensively cultivated for wheat. of Nevada, Utah, California, and Idaho. In Idaho, sagebrush grassland, saltbush–greasewood, mountain brush, and woodland occur; forests are absent unlike in the cooler, wetter, more rugged Ecoregion 19. Grazing is widespread. Cropland is less common than in Ecoregions 12 and 80. Ecoregions of Idaho The unforested hills and plateaus of the Dissected Loess Uplands ecoregion are cut by the canyons of Ecoregion 10l and are disjunct. 10f Pure grasslands dominate lower elevations. Mountain brush grows on higher, moister sites. Grazing and farming have eliminated The arid Shadscale-Dominated Saline Basins ecoregion is nearly flat, internally-drained, and has light-colored alkaline soils that are Ecoregions denote areas of general similarity in ecosystems and in the type, quality, and America into 15 ecological regions. Level II divides the continent into 52 regions Literature Cited: much of the original plant cover. Nevertheless, Ecoregion 10f is not as suited to farming as Ecoregions 10h and 10j because it has thinner soils.
    [Show full text]
  • MBMG 505-Jefferson-V2.FH10
    GEOLOGIC MAP OF THE CENOZOIC DEPOSITS OF THE UPPER JEFFERSON VALLEY MBMG Open File Report 505 2004 Compiled and mapped by Susan M. Vuke, Walter W. Coppinger, and Bruce E. Cox This report has been reviewed for conformity with Montana Bureau of Mines and Geology’s technical and editorial standards. Partial support has been provided by the STATEMAP component of the National Cooperative Geology Mapping Program of the U.S. Geological Survey under contract Number 03HQAG0090. CENOZOIC DEPOSITS OF THE UPPER JEFFERSON VALLEY Cenozoic deposits are the focus of the Geologic Map of the upper Jefferson Valley. The map is largely a compilation of previous mapping with additional interpretations based on aerial photos and limited additional field work. Older rocks are included to show their relations to the Cenozoic deposits, but they are generalized on the map. Lithologic descriptions of the Cenozoic deposits are given in the map explanation (p. 17). References used for the map compilation are shown on p. 15. The northern and southern parts of the map are discussed separately. NORTHERN PART OF MAP AREA Quaternary deposits A variety of Quaternary deposits blanket much of the slope area of the Whitetail and Pipestone Creek valleys between the flanks of the Highland Mountains and Bull Mountain (Fig. 1). East and southeast of these Quaternary slope deposits are more isolated areas of partly cemented Pleistocene gravels on pediments. One of these gravel deposits near Red Hill (Fig. 1) yielded a late Pleistocene vertebrate assemblage including cheetah, horse, camel, and large mountain sheep. Radiocarbon dates from the lowest part of the sequence range between 10,000 and 9,000 14C yr.
    [Show full text]
  • Part 629 – Glossary of Landform and Geologic Terms
    Title 430 – National Soil Survey Handbook Part 629 – Glossary of Landform and Geologic Terms Subpart A – General Information 629.0 Definition and Purpose This glossary provides the NCSS soil survey program, soil scientists, and natural resource specialists with landform, geologic, and related terms and their definitions to— (1) Improve soil landscape description with a standard, single source landform and geologic glossary. (2) Enhance geomorphic content and clarity of soil map unit descriptions by use of accurate, defined terms. (3) Establish consistent geomorphic term usage in soil science and the National Cooperative Soil Survey (NCSS). (4) Provide standard geomorphic definitions for databases and soil survey technical publications. (5) Train soil scientists and related professionals in soils as landscape and geomorphic entities. 629.1 Responsibilities This glossary serves as the official NCSS reference for landform, geologic, and related terms. The staff of the National Soil Survey Center, located in Lincoln, NE, is responsible for maintaining and updating this glossary. Soil Science Division staff and NCSS participants are encouraged to propose additions and changes to the glossary for use in pedon descriptions, soil map unit descriptions, and soil survey publications. The Glossary of Geology (GG, 2005) serves as a major source for many glossary terms. The American Geologic Institute (AGI) granted the USDA Natural Resources Conservation Service (formerly the Soil Conservation Service) permission (in letters dated September 11, 1985, and September 22, 1993) to use existing definitions. Sources of, and modifications to, original definitions are explained immediately below. 629.2 Definitions A. Reference Codes Sources from which definitions were taken, whole or in part, are identified by a code (e.g., GG) following each definition.
    [Show full text]
  • Washington Division of Geology and Earth Resources Open File Report
    OF~ 76-~ PETR)3ENFSIS OF THE MXJNT STUART BATHOLITH PID:rrnIC EQJI\7ALENT OF THE HIGH-AIJ.JMINA BASALT ASSO:IATION by Erik H. Erikson Jr. Depart:rrent of Geology Eastern Washington State College Cheney ,Wc::.shington 99004 June 1, 1976 Abstract. The 1-bunt Stuart batholith is a Late Cretaceous calc-alkaline pluton · . canposed of intrusive phases ranging in canposition fran two-pyroxene gabbro to granite. This batholith appears to represent the plutonic counterpart of the high-alumina basalt association. Mineralogical, petrological and chrono­ logical characteristics are consistent with a m:::rlel in which the intrusive series evolved fran one batch of magnesian high-alumina basalt by successive crystal fractionation of ascending residual magrna. ' canputer m:::rleling of this intrusive sequence provides a quanti- tative evaluation of the sequential change of magrna CCIIlfX)sition. These calculations indicate that this intrusive suite is consanguineous, and that subtraction of early-fonned crystals £ran the oldest magrna is capable of reprcducing the entire magrna series with a remainder of 2-3% granitic liquid. Increasing f()tash discrepancies prcduced by the rrodeling may reflect the increasing effects of volatile transfer in progressively rrore hydrous and silicic melts. Mass-balances between the arrounts of curn-ulate and residual liquid ccnpare favorably with the observed arrounts of intenrediate rocks exposed in the batholith, but not with the mafic rocks. Ma.fie cum: ulates must lie at depth. Mafic magmas probably fractionated by crystal settling, while quartz diorite and rrore granitic magrnas underwent a process of inward crystallization producing exposed gradationally zoned plutons.Aat present erosional levels.
    [Show full text]
  • Tectonic Evolution of the Northern Sierra Nevada
    TECTONIC EVOLUTION OF THE NORTHERN SIERRA NEVADA BATHOLITH A DISSERTATION SUBMITTED TO THE DEPARTMENT OF GEOLOGICAL AND ENVIRONMENTAL SCIENCES AND THE COMMITTEE ON GRADUATE STUDIES OF STANFORD UNIVERSITY IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY Nicholas James Van Buer December 2011 © 2011 by Nicholas James Van Buer. All Rights Reserved. Re-distributed by Stanford University under license with the author. This work is licensed under a Creative Commons Attribution- Noncommercial 3.0 United States License. http://creativecommons.org/licenses/by-nc/3.0/us/ This dissertation is online at: http://purl.stanford.edu/xb187vq0064 Includes supplemental files: 1. Plate 1. Geologic Map of the Jayhawk Well 7.5' Quadrangle, Pershing County, Nevada (jayhawkwell.pdf) 2. Plate 2. Geologic Map of the Juniper Pass 7.5' Quadrangle, Pershing County, Nevada (Juniperpass.pdf) 3. Plate 3. Geologic Map of the Tohakum Peak NE 7.5' Quadrangle, Pershing County, Nevada (TohakumpkNE.pdf) 4. Plate 4. Geologic Map of the Tunnel Spring 7.5' Quadrangle, Pershing County, Nevada (tunnelspr.pdf) 5. Plate 5. Geologic Map of the Bob Spring 7.5' Quadrangle, Pershing County, Nevada (bobspring.pdf) 6. Plate 6. Geologic Map of the Tohakum Peak SE 7.5' Quadrangle, Pershing County, Nevada (TohakumpkSE.pdf) 7. Plate 7. Geologic Map of the Sage Hen Spring 7.5' Quadrangle, Pershing County, Nevada (SageHenSpr.pdf) 8. Plate 8. Geologic Map of the Bluewing Spring 7.5' Quadrangle, Pershing County, Nevada (BluewingSpr.pdf) ii I certify that I have read this dissertation and that, in my opinion, it is fully adequate in scope and quality as a dissertation for the degree of Doctor of Philosophy.
    [Show full text]
  • Joshua Tree U.S
    National Park Service Joshua Tree U.S. Department of the Interior Joshua Tree National Park Geology Tour Road an 18-mile motor tour This is your guide through some of the most fascinating landscape in Joshua Tree National Park. The numbers appearing in the left margin correspond with markers along the tour route. Mileage starts at the intersection of Geology Tour Road and the main park road. The 16 stops along the 18-mile tour will require approximately two hours and will return you to this point. Soft sand and steep grades make it a challenging trip. Recreational vehicles are not recommended, but two- wheel sedans and trucks may access the route as far as Squaw Tank, marker number 9. After Squaw Tank the road gets rougher and is only recommended for White Tank 4-wheel-drive vehicles. Monzogranite and Pinto Gneiss Lost Horse Valley Please help us protect this natural environment so that others may enjoy it as you have. Geology and the The face of Earth at any one time represents only a exposed two rock bodies originally formed deep below Park fleeting phase of a very long and dynamic history. Earth’s surface: the 1.7-billion-year-old Pinto gneiss Geologic change goes on all around us, all the time. and the 85-million-year-old White Tank monzogranite, The way the landscape looks today is a result of the which intruded the gneiss as molten magma. geologic processes that have occurred throughout most of Earth’s 4.5-billion-year past. Many other geologic events occurred in this area, however the rock record has been lost through The landscape we see today in Joshua Tree National erosion.
    [Show full text]
  • Southwest MONTANA Visitvisit Southwest MONTANA
    visit SouthWest MONTANA visitvisit SouthWest MONTANA 2016 OFFICIAL REGIONAL TRAVEL GUIDE SOUTHWESTMT.COM • 800-879-1159 Powwow (Lisa Wareham) Sawtooth Lake (Chuck Haney) Pronghorn Antelope (Donnie Sexton) Bannack State Park (Donnie Sexton) SouthWest MONTANABetween Yellowstone National Park and Glacier National Park lies a landscape that encapsulates the best of what Montana’s about. Here, breathtaking crags pierce the bluest sky you’ve ever seen. Vast flocks of trumpeter swans splash down on the emerald waters of high mountain lakes. Quiet ghost towns beckon you back into history. Lively communities buzz with the welcoming vibe and creative energy of today’s frontier. Whether your passion is snowboarding or golfing, microbrews or monster trout, you’ll find endless riches in Southwest Montana. You’ll also find gems of places to enjoy a hearty meal or rest your head — from friendly roadside diners to lavish Western resorts. We look forward to sharing this Rexford Yaak Eureka Westby GLACIER Whitetail Babb Sweetgrass Four Flaxville NATIONAL Opheim Buttes Fortine Polebridge Sunburst Turner remarkable place with you. Trego St. Mary PARK Loring Whitewater Peerless Scobey Plentywood Lake Cut Bank Troy Apgar McDonald Browning Chinook Medicine Lake Libby West Glacier Columbia Shelby Falls Coram Rudyard Martin City Chester Froid Whitefish East Glacier Galata Havre Fort Hinsdale Saint Hungry Saco Lustre Horse Park Valier Box Belknap Marie Elder Dodson Vandalia Kalispell Essex Agency Heart Butte Malta Culbertson Kila Dupuyer Wolf Marion Bigfork Flathead River Glasgow Nashua Poplar Heron Big Sandy Point Somers Conrad Bainville Noxon Lakeside Rollins Bynum Brady Proctor Swan Lake Fort Fairview Trout Dayton Virgelle Peck Creek Elmo Fort Benton Loma Thompson Big Arm Choteau Landusky Zortman Sidney Falls Hot Springs Polson Lambert Crane CONTENTS Condon Fairfield Great Haugan Ronan Vaughn Plains Falls Savage De Borgia Charlo Augusta Winifred Bloomfield St.
    [Show full text]
  • Butte-Silver Bow: Recreation Destination
    Butte-Silver Bow: A World-Class Recreation Destination MAY 2015 Recreation Guide ENDORPHINS NOW. BREW PUBS LATER. What IPA goes best with a full suspension? What stout best compliments a hard tail? These are the kind of questions you’ll find the answers to after you conquer the nearby uncrowded Continental Divide Trail in Butte, Montana. After you saddle up, mosey up to a chair at one of our popular brewpubs and restaurants. Start your adventure at buttecvb.com. Letter from the Director/ Staff/ Board…Page 2 Policies…Page 4 Parks and Facility Reservations…Page 6 We’re on the web! Festivals and Special Events…Page 13 co.silverbow.mt.us/192/Parks-Recreation Find us on Facebook, Twitter, and Instagram! Bike Routes and Safe Biking…Page 18 Bike Route Map…Page 19 @ButteParks @ButteSilverBow @ButteParksandRec Programs…Page 21 On the cover: The 2014 Montana Folk Festival at the Original Mine Yard. Trails…Page 23 All photos by Derek Pruitt unless otherwise noted. Urban Trail Map…Page 24 Thompson Park Map…Page27 Partners…Page 31 Camps…Page 42 BUTTE RECREATION GUIDE 2015 1 A note from the director Dear citizens and visitors, Please join with me in celebrating how recreation creates a great quality of life in Butte-Silver Bow. Each of us are touched daily by recreational e appreciate the pursuits for ourselves, our children, our grandchildren, and our friends. As we walk for exercise, play sports, spectate at an event, or just W socialize with friends, these activities become a vital part of our days. opportunity to serve you Recreational activities become part of who we are and also how we celebrate community.
    [Show full text]
  • Recreation Opportunities
    Recreation Opportunities Beaverhead-Deerlodge National Forest United States Department Butte, Jefferson and Pintler Ranger Districts of Agriculture History Visitor Information Straddling the continental divide and covering much of In this brochure you will find a wide variety of recreation southwest Montana, the 3.3 million acre opportunities available in the Butte, Anaconda, Beaverhead-Deerlodge National Forest came into Philipsburg, Deer Lodge, Whitehall, and Boulder areas of existence on February 2, 1996, when the Forest Service the Beaverhead-Deerlodge National Forest. Our offices merged the Beaverhead and the Deerlodge National have forest maps and many brochures available to assist Forests into one administrative unit. you in planning your recreation visit to the forest. Most helpful is our Forest Visitor/Travel maps showing President Theodore Roosevelt first proclaimed the campgrounds, picnic areas, fishing access, lakes, streams, Beaverhead and Deerlodge National Forests in two road and trail locations, special interest areas, and travel separate executive orders on July 1, 1908, pulling regulations. These and wilderness maps can be purchased together lands which earlier presidents had withdrawn as at any Beaverhead-Deerlodge Forest office; other visitor the Hell Gate, Bitter Root, and Big Hole forest reserves information is free. Check out our website at between 1897 and 1905. In 1931, the Madison National www.fs.usda.gov/bdnf. Forest became part of the Beaverhead and Deerlodge National Forests. In 1945, the west slope of the Madison Range was transferred from the Gallatin National Forest Camping in the Forest to the Beaverhead National Forest. The main camping season in developed campgrounds is from Memorial Day through Labor Day weekend.
    [Show full text]