DOCSLIB.ORG

Rock Units of the Precaittbriail Basement in Colorado

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Rock Units of the Precaittbriail Basement in Colorado Rock Units of the Precaittbriail Basement in Colorado GEOLOGIC A I, Rock Units of the Precambrian Basement in Colorado By OGDEN TWETO GEOLOGY OF THE PRECAMBRIAN BASEMENT IN COLORADO U.S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 1321-A Description and distribution of Proterozoic and Archean metamorphic and igneous rocks in outcrop and the buried basement in Colorado UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1987 DEPARTMENT OF THE INTERIOR DONALD PAUL HODEL, Secretary U.S. GEOLOGICAL SURVEY Dallas L. Peck, Director Library of Congress Cataloging in Publication Data Tweto, Ogden, 1912-1983 Rock units of the Precambrian basement in Colorado. (Geological Survey Professional Paper ; 1321-A) Bibliography: p. Supt. of Docs. No.: I 19.16:1321-A 1. Geology, Stratigraphic Pre-Cambrian. 2. Geology Colorado. I. Title. II. Series. QE653.T9 1986 551.7'1'09788 84-600001 For sale by the Books and Open-File Reports Section U.S. Geological Survey Federal Center Box 25425 Denver, CO 80225 CONTENTS Page Page Abstract ............................ Al Proterozoic intrusive rocks Continued Introduction .......................... 2 Routt Plutonic Suite Continued Definition of Precambrian basement .......... 3 Pitts Meadow Granodiorite ............. A29 Regional features ..................... 3 Tenmile and Bakers Bridge Granites . 29 History of investigations ................. 5 Granodiorite of the Grand Junction area . 30 Sources of information .................. 6 Plutons beneath eastern Plains ....... 30 Stratigraphic classification ................ 7 Berthoud Plutonic Suite ............. 31 Rock terminology ..................... 8 Silver Plume Granite ............ 31 Radiometric ages ..................... 9 Cripple Creek Granite ............ 33 Archean rocks ......................... 9 San Isabel Granite .............. 33 Proterozoic layered rocks ................... 10 Sherman Granite ............... 33 Gneiss complex ...................... 10 Rocks of the Mount Ethel pluton ..... 34 Biotitic gneisses ................... 11 St. Kevin Granite .............. 35 Felsic and hornblendic gneisses .......... 14 Syenitic rocks in Gunnison-San Juan region 36 Vallecito Conglomerate and Uncompahgre Formation . 18 Vernal Mesa Quartz Monzonite ....... 37 Vallecito Conglomerate ............... 18 Curecanti Quartz Monzonite ........ 37 Uncompahgre Formation .............. 19 Eolus Granite ................ 38 Las Animas Formation .................. 20 Trimble Granite ............... 38 Uinta Mountain Group .................. 21 Electra Lake Gabbro ............ 39 Proterozoic intrusive rocks .................. 22 Subsurface units ............... 39 Groupings of igneous rocks ............... 22 Mafic and intermediate dikes .......... 39 Routt Plutonic Suite ................... 23 Rocks of the Pikes Peak batholith ....... 41 Rocks of the Rawah batholith ........... 23 Pikes Peak Granite ............. 41 Rocks of the Boulder Creek batholith ....... 24 Associated subalkalic rocks ......... 43 Rocks of the Mount Evans batholith ....... 25 Windy Point Granite ............ 43 Gabbro of Elkhorn Mountain ............ 25 Redskin Granite ............... 44 Cross C^eek Quartz Monzonite ........... 26 Syenite and gabbro plutons ......... 44 Denny Creek Granodiorite ............. 26 Latest Proterozoic and Cambrian rocks .... 45 Kroenke Granodiorite ................ 27 Tectonic influences ................... 45 Granitic rocks in Taylor Park-Gunnison region . 27 References cited .................... 47 Powderhorn Granite and related rocks ...... 29 ILLUSTRATIONS Page PLATE 1. Geologic map of the Precambrian basement in Colorado. In pocket FIGURES 1-4. Maps showing: 1. Proterozoic and Archean age provinces in Rocky Mountain region .... A4 2. Major tectonic and geographic features in Colorado ............. 5 3. Principal Precambrian plutons and some major fracture zones in Colorado 13 4. Intrusive bodies and centers in exposed part of Pikes Peak batholith . 42 TABLE TABLE 1. Major Precambrian rock units in Colorado ............................................ A8 in GEOLOGY OF THE PRECAMBRIAN BASEMENT IN COLORADO ROCK UNITS OF THE PRECAMBRIAN BASEMENT IN COLORADO By OGDEN TWETO ABSTRACT The term Precambrian basement as used in this report applies to lutetium-hafnium ages in the range 1,740-1,800 m.y. obtained from all rocks of Precambrian age. Basement rocks are exposed in many igneous components of the gneisses suggest that the age of the pro­ places in mountain uplifts in central and western Colorado, but are tolith was little greater than the age of metamorphism and probably buried beneath younger rocks in more than 86 percent of the State. does not exceed 1,800 m.y. The exposed basement consists of variously metamorphosed layered According to recent studies, the Vallecito Conglomerate of the rocks and of intrusive igneous rocks, in about equal proportions. The Needle Mountains in southwestern Colorado is younger than and lies buried basement is of the same general character as the exposed unconformably upon the Irving Formation of the Proterozoic gneiss basement except for the presence in southeastern Colorado of a unit complex. This is a reversal of some former interpretations but is of moderately metamorphosed sedimentary and volcanic rocks (Las in agreement with the original classification. The Vallecito is a mas­ Animas Formation) not known elsewhere. sive unit of conglomerate and pebbly quartzite more than 1,500 m The Precambrian rocks are all of Proterozoic age except in a small (5,000 ft) thick. The Uncompahgre Formation nearby may be a lateral area near the northwest corner of the State, where Archean rocks equivalent of the Vallecito. The Uncompahgre consists of more than at the south margin of the Wyoming cratonic age province are pres­ 2,650 m (8,700 ft) of quartzite, slate, and phyllite. The Uncompahgre ent, mainly in the subsurface. As exposed at the Colorado-Utah bor­ and Vallecito are preserved in three areas in a northwest-trending der and westward, the Archean rocks consist of gneisses about 2,700 belt in the western San Juan Mountains region. This belt may ap­ m.y. (million years) in age and of the Red Creek Quartzite. The Red proximate the original depositional trough. Ages of the two forma­ Creek is not conclusively dated but is interpreted as-probably older tions are known only as being younger than a 1,695-m.y. granite than the 2,500-m.y. age boundary between the Archean and Protero­ and older than a 1,440-m.y. granite. zoic Eons. The Archean gneisses are mainly of granitic composition The Middle Proterozoic Las Animas Formation is recognized only and igneous origin. They are exposed only in small fault blocks sepa­ in the subsurface in southeastern Colorado. The formation consists rated from the Red Creek by zones of quartz mylonite. The Red predominantly of dark-gray to black slate, phyllite, graywacke, and Creek Quartzite consists of at least 4 km (13,000 ft) of metaquartzite, chert, but an upper part is dull red and contains minor volcanic and kyanite-bearing quartz-muscovite schist, and minor marble, all exten­ carbonate rocks. A thickness of more than 1,700 m (5,575 ft) has sively intruded by sills now metamorphosed to amphibolite. Faulting been penetrated in boreholes, without the base being reached. The that occurred before and at various times after deposition of the Red formation occupies a west-trending belt about 130 km (80 mi) long Creek indicates recurrent tectonism at the border of the Archean and as much as 50 km (31 mi) wide. It is interpreted as fill in a Wyoming province. rift incised in a terrane of mesozonal granite about 1,400 m.y. in The oldest and most widespread of the Proterozoic rocks in Col­ age. The Las Animas is tentatively correlated with rocks in the orado are gneisses in a complex that constitutes part of the floor Wichita Mountains province of southern Oklahoma that are thought on which younger Precambrian sedimentary units rest and the matrix to be younger than 1,400 m.y. and older than 1,200 m.y. into which igneous rocks were intruded. The gneisses were derived The Uinta Mountain Group constitutes the core of the eastern from a heterogeneous sedimentary and volcanic protolith. They are Uinta Mountains in northwestern Colorado and is present in the sub­ metamorphosed in the upper or the lower amphibolite facies in most surface eastward at least to Craig. The group, which is more than places in Colorado, but are of lower metamorphic rank in a few areas. 7 km (3.7 mi) thick, consists of quartzites accompanied by thick They are divided broadly into biotitic varieties, largely metasedimen- wedges of conglomerate and subordinate shale and siltstone. It lies tary, and felsic and hornblendic varieties, largely metavolcanic. These in part on Archean rocks at the southern border of the Wyoming rock units occur both in large discrete bodies and intimately inter- cratonic age province and evidently was deposited in a fault-bounded layered with one another. The principal species of biotitic gneiss is trough in that structural zone. The group ranges in age from about biotite-quartz-plagioclase gneiss, some of which contains sillimanite, 925 to 1,100 m.y. and is equivalent in part to the compositionally garnet, or cordierite. Metaquartzite and marble or calc-silicate rocks similar Belt Supergroup of Montana and Idaho and Grand Canyon occur locally in the biotitic gneisses. In the subsurface in eastern Supergroup of Arizona. Colorado, a metaquartzite-mica schist facies is predominant. The fel­ Igneous intrusion began during
Load more

Recommended publications
  • PEAK to PRAIRIE: BOTANICAL LANDSCAPES of the PIKES PEAK REGION Tass Kelso Dept of Biology Colorado College 2012
    !"#$%&'%!(#)()"*%+'&#,)-#.%.#,/0-#!"0%'1%&2"%!)$"0% !"#$%("3)',% &455%$6758% /69:%8;%+<878=>% -878?4@8%-8776=6% ABCA% Kelso-Peak to Prairie Biodiversity and Place: Landscape’s Coat of Many Colors Mountain peaks often capture our imaginations, spark our instincts to explore and conquer, or heighten our artistic senses. Mt. Olympus, mythological home of the Greek gods, Yosemite’s Half Dome, the ever-classic Matterhorn, Alaska’s Denali, and Colorado’s Pikes Peak all share the quality of compelling attraction that a charismatic alpine profile evokes. At the base of our peak along the confluence of two small, nondescript streams, Native Americans gathered thousands of years ago. Explorers, immigrants, city-visionaries and fortune-seekers arrived successively, all shaping in turn the region and communities that today spread from the flanks of Pikes Peak. From any vantage point along the Interstate 25 corridor, the Colorado plains, or the Arkansas River Valley escarpments, Pikes Peak looms as the dominant feature of a diverse “bioregion”, a geographical area with a distinct flora and fauna, that stretches from alpine tundra to desert grasslands. “Biodiversity” is shorthand for biological diversity: a term covering a broad array of contexts from the genetics of individual organisms to ecosystem interactions. The news tells us daily of ongoing threats from the loss of biodiversity on global and regional levels as humans extend their influence across the face of the earth and into its sustaining processes. On a regional level, biologists look for measures of biodiversity, celebrate when they find sites where those measures are high and mourn when they diminish; conservation organizations and in some cases, legal statutes, try to protect biodiversity, and communities often struggle to balance human needs for social infrastructure with desirable elements of the natural landscape.
    [Show full text]
  • Mountain Goat Unit Management Plan | Wasatch and Central Mountains
    MOUNTAIN GOAT UNIT MANAGEMENT PLAN Wasatch and Central Mountains Lone Peak / Box Elder Peak / Timpanogos / Provo Peak / Nebo August 2019 BOUNDARY DESCRIPTIONS Lone Peak – Salt Lake County: Boundary begins at the junction of I-15 and I-80 in Salt Lake City; east on I-80 to the Salt Lake-Summit county line; south along this county line to the Salt Lake-Wasatch county line; southwest along this county line to the Salt Lake-Utah county line; southwest along this county line to I-15; north on I-15 to I-80 in Salt Lake City. Box Elder Peak – Utah County: Boundary begins at I-15 and the Salt Lake-Utah county line; east along this county line to the Utah-Wasatch county line; south along this county line to “Pole Line Pass” on the Snake Creek-North Fork American Fork Canyon road; west on this road to SR-92; west on SR-92 to I-15; north on I-15 to the Salt Lake-Utah county line. Timpanogos – Utah County: Boundary begins at the junction of SR-92 and SR-146; southeast on SR-92 to US-189; southwest on US-189 to SR-52; west on SR-52 to US-89; north on US-89 to SR-146; north on SR-146 to SR-92. Provo Peak – Utah County: Boundary begins at the junction of I-15 and US-6 at Spanish Fork; north on I-15 to SR-52; east on SR-52 to US-189; northeast on US-189 to the South Fork Drainage of Provo Canyon; east along this drainage bottom to the Berryport trail; south along this trail to the Left Fork of Hobble Creek road; south on this road to the Right Fork of Hobble Creek road; east on this road to Cedar Canyon; south along this canyon bottom to Wanrhodes Canyon; south along this canyon bottom to Diamond Fork Creek; southwest along this creek to US-6; northeast on US-6 to I-15.
    [Show full text]
  • Denudation History and Internal Structure of the Front Range and Wet Mountains, Colorado, Based on Apatite-Fission-Track Thermoc
    NEW MEXICO BUREAU OF GEOLOGY & MINERAL RESOURCES, BULLETIN 160, 2004 41 Denudation history and internal structure of the Front Range and Wet Mountains, Colorado, based on apatite­fission­track thermochronology 1 2 1Department of Earth and Environmental Science, New Mexico Institute of Mining and Technology, Socorro, NM 87801Shari A. Kelley and Charles E. Chapin 2New Mexico Bureau of Geology and Mineral Resources, New Mexico Institute of Mining and Technology, Socorro, NM 87801 Abstract An apatite fission­track (AFT) partial annealing zone (PAZ) that developed during Late Cretaceous time provides a structural datum for addressing questions concerning the timing and magnitude of denudation, as well as the structural style of Laramide deformation, in the Front Range and Wet Mountains of Colorado. AFT cooling ages are also used to estimate the magnitude and sense of dis­ placement across faults and to differentiate between exhumation and fault­generated topography. AFT ages at low elevationX along the eastern margin of the southern Front Range between Golden and Colorado Springs are from 100 to 270 Ma, and the mean track lengths are short (10–12.5 µm). Old AFT ages (> 100 Ma) are also found along the western margin of the Front Range along the Elkhorn thrust fault. In contrast AFT ages of 45–75 Ma and relatively long mean track lengths (12.5–14 µm) are common in the interior of the range. The AFT ages generally decrease across northwest­trending faults toward the center of the range. The base of a fossil PAZ, which separates AFT cooling ages of 45– 70 Ma at low elevations from AFT ages > 100 Ma at higher elevations, is exposed on the south side of Pikes Peak, on Mt.
    [Show full text]
  • Pikes Peak Group Program – February 18 Denise Snow Presents: Cross Country Skiing Around the World
    Pikes Pique The Newsletter of the CMC Pikes Peak Group February, 2020 | No. 264 Pikes Peak Group Program – February 18 Denise Snow presents: Cross Country Skiing Around The World There are many opportunities for cross country ski vacations around the world. Many countries support a stronger cross country culture than what we have in the United States and make it much easier to travel and ski hundreds of kilometers of well prepared tracks. Come and see skiing opportunities from Norway to New Zealand and beyond as well as the advantages that can be found in places where great skiing is not just for the downhill folks. Come join Denise at the Ivywild School Center, 1604 S Cascade Ave. Happy hour at 6:00, program starts at 6:30 in the Barrel Room. Hope to see you there! The Pikes Peak Group in Pictures Aiken Canyon Hike New Member Orientation L–R: Vishal Rana, Adam Keller, Ray Ruiz, Adrienne Ross, Tyler L–R: Gary Marx, Missy Starks, Randy Bliss, Joanne Larraga, Jim King, Ruben Valdez, Emily Ernst, Audrey Burkart (co-leader), and Thieme, and Keely Nolan. Kay Cower. Keely and Randy are members of the Denver group. Photo credit: Dean Waits (leader) More on page 3! 1 Welcome New Members! Your PPG Council Katharina Anderson Tyler King Chair – Kristen Buckland Tracey Anderson Benjamin Ladau 419-260-7807, [email protected] Margo Bedford Terrence Ladau Past Chair – Vacant Ramsey Blahnik Wendy Ladau ARCPro Director – Scott Kime Reed Blahnik Andrew Laub 719-235-0939, [email protected] Joe Cocklin Vickie Laughlin BMS Co-Directors – Tom Mulcahy
    [Show full text]
  • Colorado Fourteeners Checklist
    Colorado Fourteeners Checklist Rank Mountain Peak Mountain Range Elevation Date Climbed 1 Mount Elbert Sawatch Range 14,440 ft 2 Mount Massive Sawatch Range 14,428 ft 3 Mount Harvard Sawatch Range 14,421 ft 4 Blanca Peak Sangre de Cristo Range 14,351 ft 5 La Plata Peak Sawatch Range 14,343 ft 6 Uncompahgre Peak San Juan Mountains 14,321 ft 7 Crestone Peak Sangre de Cristo Range 14,300 ft 8 Mount Lincoln Mosquito Range 14,293 ft 9 Castle Peak Elk Mountains 14,279 ft 10 Grays Peak Front Range 14,278 ft 11 Mount Antero Sawatch Range 14,276 ft 12 Torreys Peak Front Range 14,275 ft 13 Quandary Peak Mosquito Range 14,271 ft 14 Mount Evans Front Range 14,271 ft 15 Longs Peak Front Range 14,259 ft 16 Mount Wilson San Miguel Mountains 14,252 ft 17 Mount Shavano Sawatch Range 14,231 ft 18 Mount Princeton Sawatch Range 14,204 ft 19 Mount Belford Sawatch Range 14,203 ft 20 Crestone Needle Sangre de Cristo Range 14,203 ft 21 Mount Yale Sawatch Range 14,200 ft 22 Mount Bross Mosquito Range 14,178 ft 23 Kit Carson Mountain Sangre de Cristo Range 14,171 ft 24 Maroon Peak Elk Mountains 14,163 ft 25 Tabeguache Peak Sawatch Range 14,162 ft 26 Mount Oxford Collegiate Peaks 14,160 ft 27 Mount Sneffels Sneffels Range 14,158 ft 28 Mount Democrat Mosquito Range 14,155 ft 29 Capitol Peak Elk Mountains 14,137 ft 30 Pikes Peak Front Range 14,115 ft 31 Snowmass Mountain Elk Mountains 14,099 ft 32 Windom Peak Needle Mountains 14,093 ft 33 Mount Eolus San Juan Mountains 14,090 ft 34 Challenger Point Sangre de Cristo Range 14,087 ft 35 Mount Columbia Sawatch Range
    [Show full text]
  • DAR-Colorado-Marker-Book.Pdf
    When Ms. Charlotte McKean Hubbs became Colorado State Regent, 2009-2011, she asked that I update "A Guidebook to DAR Historic Markers in Colorado" by Hildegarde and Frank McLaughlin. This publication was revised and updated as a State Regent's project during Mrs. Donald K. Andersen, Colorado State Regent 1989-1991 from the original 1978 version of Colorado Historical Markers. Purpose of this Project was to update information and add new markers since the last publication and add the Santa Fe Trail Markers in Colorado by Mary B. and Leo E. Gamble to this publication. Assessment Forms were sent to each Chapter Historian to complete on their Chapter markers. These assessments will be used to document the condition of each site. GPS (Lat/Long) co-ordinances were to be included for future interactive mapping. Current digital photographs of markers were included where chapters participated, some markers are missing, so original photographs were used. By digitizing this publication, an on-line publication can be purchased by anyone interested in our Colorado Historical Markers and will make updating, revising and adding new markers much easier. Our hopes were to include a Website of the Colorado Historical Markers accessible on our Colorado State Society Website. I would like to thank Jackie Sopko, Arkansas Valley Chapter, Pueblo Colorado for her long hours in front of a computer screen, scanning, updating, formatting and supporting me in this project. I would also like to thank the many Colorado DAR Chapters that participated in this project. I owe them all a huge debt of gratitude for giving freely of their time to this project.
    [Show full text]
  • To Download Elementary School Geology Packet
    Garden of the Gods Park Contact: Bowen Gillings City of Colorado Springs Parks, Recreation & Cultural Services Email: [email protected] P: (719) 219-0108 Program updates can be found at: https://gardenofgods.com/educational/edu- 1/school-field-trips Land Use Acknowledgement: We gratefully acknowledge the native peoples on whose ancestral homeland we gather, as well as the diverse and vibrant Native communities of Colorado today. Geology of the Park Program Welcome! We look forward to sharing the geological story of Garden of the Gods with your students. We align with current Colorado Academic Standards for K-5 Earth and Space Science. Goals: Students recognize the exceptional geological wonder of the Garden of the Gods. Students gain a broad understanding of the geological events that shaped the Pikes Peak region Students gain a broad understanding of and appreciation for the science of geology. Students identify the three rock types and the three geological processes. Students recognize the geological formations in the Park, their ages, and composition. 1 Teacher Reference Guide: Basic Geology of Garden of the Gods The Pike’s Peak region has been shaped by millions of years of mountain building and erosion. There have been three different mountain building events in the geological history of this area: 1. The Ancestral Rockies (320-310 million years ago). The erosion of these first Rocky Mountains formed the sedimentary Fountain Formation and the Lyons Sandstone layers. 2. The Laramide Orogeny (70-65 million years ago). This process uplifted the Front Range. The layers seen in the Garden were forced upright as the land broke along the Rampart Range Fault.
    [Show full text]
  • 2020 Visitor Guide Available Online
    Page 2 Page 3 Inside the Guide... Gold Belt Tour Page 10 Trails of Gold Map Page 7 Cripple Creek Parks Page 32 Events Page 8 Fishing Page 31 Gambling Page 17 Historic Cemeteries Page 30 Lodging Page 9, 26 Mine Tours Page 29 Modern Mining Page 28 Museums Page 24, 25 Scenic Overlooks Page 33 Shuttle Website Info Page 7 Theater Page 22 Train Ride Page 20 Victor Ice Rink Page 32 Cripple Creek Page 16, 17 Victor Page 12, 14 Thanks to our advertisers for their support and to our contributors for their content. This guide is a product of ZStudios, POB 244, Victor, CO 80860. This guide and more information available online at VictorColorado.com. All contents copyright April 2020. Page 4 old! Few words can change the character of an entire region like the cry of “gold fever”. Gold was discovered here in 1890; the fever spread like wildfire, bringing thousands to the PiGkes Peak region. Prospectors Bob Womack and Winfield Scott Stratton discovered the gold ore that touched off the legendary Cripple Creek and Victor Gold Rush. The ranching country on Pikes Peak's western slopes was transformed as thousands flocked to the area to seek their for - tunes. Towns sprang up on the mountainsides serving 500 gold mines, all requiring fuel, sup - plies, transportation, and a large supply of labor. It became a priority to link the Cripple Creek and Victor Mining District to places beyond. Two stage roads and three railroads were built to carry lumber, food, coal, ore, and people to and from the mining district towns.
    [Show full text]
  • 2020 Staunton State Park - Phase II-B Construction Improvements DIVISION I - SPECIFICATIONS
    2020 Staunton State Park - Phase II-B Construction Improvements DIVISION I - SPECIFICATIONS PROJECT I.D. NO. C19ST3 RQS: 2021*0148 APPR. CODE PC002INFP PRE-BID CONFERENCE: August 19, 2020 at 1:30 PM BID OPENING: August 26, 2020 at 1:30 PM PROJECT MANUAL STAUNTON STATE PARK - PHASE II -B 06/26/20 6/23/20 100% CD Job #: 2018.113 2020.06.26 6/25/2020 TABLE OF CONTENTS DIVISION 00 - PROCUREMENT AND CONTRACTING REQUIREMENTS 00 3100 AVAILABLE PROJECT INFORMATION Geotechnical Report DIVISION 01 - GENERAL REQUIREMENTS 01 1000 SUMMARY 01 2214 MEASUREMENT AND PAYMENT 01 3000 ADMINISTRATIVE REQUIREMENTS 01 4000 QUALITY REQUIREMENTS 01 4100 REGULATORY REQUIREMENTS 01 4120 ENVIRONMENTAL QUALITY PROTECTION 01 4533 CODE-REQUIRED SPECIAL INSPECTIONS AND PROCEDURES 01 5000 TEMPORARY FACILITIES AND CONTROLS 01 6000 PRODUCT REQUIREMENTS 01 7000 EXECUTION AND CLOSEOUT REQUIREMENTS 01 7800 CLOSEOUT SUBMITTALS DIVISION 03 - CONCRETE 03 3000 CAST-IN-PLACE CONCRETE 03 4500 PRECAST ARCHITECTURAL CONCRETE DIVISION 04 - MASONRY 04 7200 STONE MASONRY VENEER DIVISION 05 - METALS 05 1200 STRUCTURAL STEEL FRAMING 05 5000 METAL FABRICATIONS DIVISION 06 - WOOD, PLASTICS, AND COMPOSITES 06 1000 ROUGH CARPENTRY 06 1753 SHOP-FABRICATED WOOD TRUSSES 06 1800 GLUED-LAMINATED WOOD CONSTRUCTION 06 2000 FINISH CARPENTRY DIVISION 07 - THERMAL AND MOISTURE PROTECTION 07 1900 GRAFFITI COATINGS 07 4113 METAL ROOF PANELS 07 4646 FIBER CEMENT SIDING 07 6200 SHEET METAL FLASHING AND TRIM 07 9200 JOINT SEALANTS DIVISION 09 - FINISHES 09 9113 EXTERIOR PAINTING 09 9600 HIGH-PERFORMANCE
    [Show full text]
  • San Juan National Forest
    SAN JUAN NATIONAL FOREST Colorado UNITED STATES DEPARTMENT OF AGRICULTURE V 5 FOREST SERVICE t~~/~ Rocky Mountain Region Denver, Colorado Cover Page. — Chimney Rock, San Juan National Forest F406922 UNITED STATES GOVERNMENT PRINTING OFFICE WASHINGTON : 1942 * DEPOSITED BY T,HE UNITED STATES OF AMERICA San Juan National Forest CAN JUAN NATIONAL FOREST is located in the southwestern part of Colorado, south and west of the Continental Divide, and extends, from the headwaters of the Navajo River westward to the La Plata Moun- \ tains. It is named after the San Juan River, the principal river drainage y in this section of the State, which, with its tributaries in Colorado, drains the entire area within the forest. It contains a gross area of 1,444,953 ^ acres, of which 1,255,977 are Government land under Forest Service administration, and 188,976 are State and privately owned. The forest was created by proclamation of President Theodore Roosevelt on June 3, 1905. RICH IN HISTORY The San Juan country records the march of time from prehistoric man through the days of early explorers and the exploits of modern pioneers, each group of which has left its mark upon the land. The earliest signs of habitation by man were left by the cliff and mound dwellers. Currently with or following this period the inhabitants were the ancestors of the present tribes of Indians, the Navajos and the Utes. After the middle of the eighteenth century the early Spanish explorers and traders made their advent into this section of the new world in increasing numbers.
    [Show full text]
  • American Rockies: Photographs by Gus Foster EXHIBITION LIST All
    American Rockies: Photographs by Gus Foster EXHIBITION LIST All photographs courtesy of artist except Windom Peak. Photographs are Ektacolor prints. Dimensions are frame size only. 1. Wheeler Peak, 1987 Sangre de Cristo Range Wheeler Peak Wilderness, New Mexico 360 degree panoramic photograph 30" x 144" 2. Continental Divide, 1998 Black Range Aldo Leopold Wilderness, New Mexico 372 degree panoramic photograph 24" x 96" 3. Truchas Lakes, 1986 Sangre de Cristo Range Pecos Wilderness, New Mexico 378 degree panoramic photograph 24" x 96" 4. Pecos Big Horns, 1989 Sangre de Cristo Range Pecos Wilderness, New Mexico 376 degree panoramic photograph 24" x 96" 5. Aspens, 1993 Sangre de Cristo Range Santa Fe National Forest, New Mexico 375 degree panoramic photograph 30" x 144" 6. Sandia Mountains, 1997 Sangre de Cristo Range Sandia Mountain Wilderness, New Mexico 365 degree panoramic photograph 16" x 70" 7. Chimayosos Peak, 1988 Sangre de Cristo Range Pecos Wilderness, New Mexico 376 degree panoramic photograph 16" x 70" 8. Venado Peak, 1990 Sangre de Cristo Range Latir Wilderness, New Mexico 380 degree panoramic photograph 16" x 70" 9. Winter Solstice, 1995 Sangre de Cristo Range Carson National Forest, New Mexico 368 degree panoramic photograph 16" x 70" 10. Beaver Creek Drainage, 1988 Carson National Forest Cruces Basin Wilderness, New Mexico 384 degree panoramic photograph 30" x 144" 11. Mt. Antero, 1990 Sawatch Range San Isabel National Forest, Colorado 368 degree panoramic photograph 24" x 96" 12. Mt. Yale, 1988 Sawatch Range Collegiate Peaks Wilderness, Colorado 370 degree panoramic photograph 24" x 96" 13. Windom Peak, 1989 Needle Mountains, San Juan Range Weminuche Wilderness, Colorado 378 degree panoramic photograph 30" x 144" Collection of The Albuquerque Museum 14.
    [Show full text]
  • Description of the Telluride Quadrangle
    DESCRIPTION OF THE TELLURIDE QUADRANGLE. INTRODUCTION. along the southern base, and agricultural lands water Jura of other parts of Colorado, and follow­ vents from which the lavas came are unknown, A general statement of the geography, topography, have been found in valley bottoms or on lower ing them comes the Cretaceous section, from the and the lavas themselves have been examined slopes adjacent to the snow-fed streams Economic Dakota to the uppermost coal-bearing member, the only in sufficient degree to show the predominant and geology of the San Juan region of from the mountains. With the devel- imp°rtance- Colorado. Laramie. Below Durango the post-Laramie forma­ presence of andesites, with other types ranging opment of these resources several towns of tion, made up of eruptive rock debris and known in composition from rhyolite to basalt. Pene­ The term San Juan region, or simply " the San importance have been established in sheltered as the "Animas beds," rests upon the Laramie, trating the bedded series are several massive Juan," used with variable meaning by early valleys on all sides. Railroads encircle the group and is in turn overlain by the Puerco and higher bodies of often coarsely granular rocks, such as explorers, and naturally with indefinite and penetrate to some of the mining centers of Eocene deposits. gabbro and diorite, and it now seems probable limitation during the period of settle- sa^juan the the interior. Creede, Silverton, Telluride, Ouray, Structurally, the most striking feature in the that the intrusive bodies of diorite-porphyry and ment, is. now quite.
    [Show full text]