Penitente Canyon and Elephant Rock
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Southern Rockies Lynx Management Direction Volume 1
USDA FINAL Environmental Impact Statement Forest Service Southern Rockies United States NationalDepartment Forests of in ColoradoAgriculture & southern Wyoming Lynx Management OctoberForest 2008 Service Rocky Mountain Region Direction Southern RockiesVolume Lynx Amendment 1 Record of Decision October 2008 The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information, political beliefs, reprisal, or because all or part of an individual's income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) Persons with disabilities who require alternative means for communication of program information (Braille, large print, audiotape, etc.) should contact USDA's TARGET Center at (202) 720-2600 (voice and TDD). To file a complaint of discrimination, write to USDA, Director, Office of Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410, or call (800) 795-3272 (voice) or (202) 720-6382 (TDD). USDA is an equal opportunity provider and employer. Lead Agency: Plan. The SDEIS added information and analysis United States Department of Agriculture for the White River National Forest to the material Forest Service, Rocky Mountain Region already provided for the other six national forest units. Cooperating Agency: Colorado Department of Natural Resources The No Action alternative (Alternative A) was developed as a baseline for comparing the effects States Affected: of Alternatives B, C and D. The purpose and need Colorado and southern Wyoming for action is to establish direction that conserves Responsible Official: and promotes recovery of Canada lynx, and Rick D. -
Geologic Map of the Central San Juan Caldera Cluster, Southwestern Colorado by Peter W
Geologic Map of the Central San Juan Caldera Cluster, Southwestern Colorado By Peter W. Lipman Pamphlet to accompany Geologic Investigations Series I–2799 dacite Ceobolla Creek Tuff Nelson Mountain Tuff, rhyolite Rat Creek Tuff, dacite Cebolla Creek Tuff Rat Creek Tuff, rhyolite Wheeler Geologic Monument (Half Moon Pass quadrangle) provides exceptional exposures of three outflow tuff sheets erupted from the San Luis caldera complex. Lowest sheet is Rat Creek Tuff, which is nonwelded throughout but grades upward from light-tan rhyolite (~74% SiO2) into pale brown dacite (~66% SiO2) that contains sparse dark-brown andesitic scoria. Distinctive hornblende-rich middle Cebolla Creek Tuff contains basal surge beds, overlain by vitrophyre of uniform mafic dacite that becomes less welded upward. Uppermost Nelson Mountain Tuff consists of nonwelded to weakly welded, crystal-poor rhyolite, which grades upward to a densely welded caprock of crystal-rich dacite (~68% SiO2). White arrows show contacts between outflow units. 2006 U.S. Department of the Interior U.S. Geological Survey CONTENTS Geologic setting . 1 Volcanism . 1 Structure . 2 Methods of study . 3 Description of map units . 4 Surficial deposits . 4 Glacial deposits . 4 Postcaldera volcanic rocks . 4 Hinsdale Formation . 4 Los Pinos Formation . 5 Oligocene volcanic rocks . 5 Rocks of the Creede Caldera cycle . 5 Creede Formation . 5 Fisher Dacite . 5 Snowshoe Mountain Tuff . 6 Rocks of the San Luis caldera complex . 7 Rocks of the Nelson Mountain caldera cycle . 7 Rocks of the Cebolla Creek caldera cycle . 9 Rocks of the Rat Creek caldera cycle . 10 Lava flows premonitory(?) to San Luis caldera complex . .11 Rocks of the South River caldera cycle . -
(2000), Voluminous Lava-Like Precursor to a Major Ash-Flow
Journal of Volcanology and Geothermal Research 98 (2000) 153–171 www.elsevier.nl/locate/jvolgeores Voluminous lava-like precursor to a major ash-flow tuff: low-column pyroclastic eruption of the Pagosa Peak Dacite, San Juan volcanic field, Colorado O. Bachmanna,*, M.A. Dungana, P.W. Lipmanb aSection des Sciences de la Terre de l’Universite´ de Gene`ve, 13, Rue des Maraıˆchers, 1211 Geneva 4, Switzerland bUS Geological Survey, 345 Middlefield Rd, Menlo Park, CA, USA Received 26 May 1999; received in revised form 8 November 1999; accepted 8 November 1999 Abstract The Pagosa Peak Dacite is an unusual pyroclastic deposit that immediately predated eruption of the enormous Fish Canyon Tuff (ϳ5000 km3) from the La Garita caldera at 28 Ma. The Pagosa Peak Dacite is thick (to 1 km), voluminous (Ͼ200 km3), and has a high aspect ratio (1:50) similar to those of silicic lava flows. It contains a high proportion (40–60%) of juvenile clasts (to 3–4 m) emplaced as viscous magma that was less vesiculated than typical pumice. Accidental lithic fragments are absent above the basal 5–10% of the unit. Thick densely welded proximal deposits flowed rheomorphically due to gravitational spreading, despite the very high viscosity of the crystal-rich magma, resulting in a macroscopic appearance similar to flow- layered silicic lava. Although it is a separate depositional unit, the Pagosa Peak Dacite is indistinguishable from the overlying Fish Canyon Tuff in bulk-rock chemistry, phenocryst compositions, and 40Ar/39Ar age. The unusual characteristics of this deposit are interpreted as consequences of eruption by low-column pyroclastic fountaining and lateral transport as dense, poorly inflated pyroclastic flows. -
Ignimbrites to Batholiths Ignimbrites to Batholiths: Integrating Perspectives from Geological, Geophysical, and Geochronological Data
Ignimbrites to batholiths Ignimbrites to batholiths: Integrating perspectives from geological, geophysical, and geochronological data Peter W. Lipman1,* and Olivier Bachmann2 1U.S. Geological Survey, Mail Stop 910, Menlo Park, California 94028, USA 2Institute of Geochemistry and Petrology, ETH Zurich, CH-8092 Zürich, Switzerland ABSTRACT related intrusions cooled and solidified soon shorter. Magma-supply estimates (from ages after zircon crystallization, as magma sup- and volcano-plutonic volumes) yield focused Multistage histories of incremental accu- ply waned. Some researchers interpret these intrusion-assembly rates sufficient to gener- mulation, fractionation, and solidification results as recording pluton assembly in small ate ignimbrite-scale volumes of eruptible during construction of large subvolcanic increments that crystallized rapidly, leading magma, based on published thermal models. magma bodies that remained sufficiently to temporal disconnects between ignimbrite Mid-Tertiary processes of batholith assembly liquid to erupt are recorded by Tertiary eruption and intrusion growth. Alternatively, associated with the SRMVF caused drastic ignimbrites, source calderas, and granitoid crystallization ages of the granitic rocks chemical and physical reconstruction of the intrusions associated with large gravity lows are here inferred to record late solidifica- entire lithosphere, probably accompanied by at the Southern Rocky Mountain volcanic tion, after protracted open-system evolution asthenospheric input. field (SRMVF). Geophysical -
Stansbury Brings Listening Tour to Placitas by the Numbers
SANDOVAL PLACITAS PRSRT-STD U.S. Postage Paid BERNALILLO Placitas, NM Permit #3 CORRALES SANDOVAL Postal Customer or Current Resident COUNTY ECRWSS NEW MEXICO SignA N INDEPENDENT PLOCAL NEWSPAPER St S INCE 1988 • VOL. 32 / NO 9 • SEPTEMBER 2021 • FREE IVEN By the numbers: D ILL New Mexico and —B the 2020 Census ~SIGNPOST STAFF While Sandoval County remains among the fastest growing counties in the state, New Mexico’s overall growth rate lags well behind its neighbors, according to data from the 2020 Census released last month. Over the last ten years, Sandoval County grew by 17,273 residents for a total population of 148,834, a 13.1 percent increase. Faster growth was noted only in Eddy County, 15.8 percent, and Lea County, 15 percent, both in the southeast Oil Patch. Sandoval remains the fourth-largest county by pop- ulation behind Bernalillo, Doña Ana, and Santa Fe counties. The state’s population reached 2.1 million with 58,343 more residents, up 2.8 percent since the 2010 Census. The nation as a whole grew by 7.4 percent, the lowest rate since the 1930s, and compares to rates U.S. Rep. Melanie Stansbury visits with John Stebbins of Placitas after her listening session of ten percent or more in states surrounding New at the Placitas Community Library. Stansbury, elected in June to fill out Rep. Deb Haaland’s term, Mexico except Oklahoma. was touring the district with her staff during the August congressional recess. Data also show New Mexico to be among the most racially and ethnically diverse state. -
40Ar/39Ar Dating of the Late Cretaceous Jonathan Gaylor
40Ar/39Ar Dating of the Late Cretaceous Jonathan Gaylor To cite this version: Jonathan Gaylor. 40Ar/39Ar Dating of the Late Cretaceous. Earth Sciences. Université Paris Sud - Paris XI, 2013. English. NNT : 2013PA112124. tel-01017165 HAL Id: tel-01017165 https://tel.archives-ouvertes.fr/tel-01017165 Submitted on 2 Jul 2014 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Université Paris Sud 11 UFR des Sciences d’Orsay École Doctorale 534 MIPEGE, Laboratoire IDES Sciences de la Terre 40Ar/39Ar Dating of the Late Cretaceous Thèse de Doctorat Présentée et soutenue publiquement par Jonathan GAYLOR Le 11 juillet 2013 devant le jury compose de: Directeur de thèse: Xavier Quidelleur, Professeur, Université Paris Sud (France) Rapporteurs: Sarah Sherlock, Senoir Researcher, Open University (Grande-Bretagne) Bruno Galbrun, DR CNRS, Université Pierre et Marie Curie (France) Examinateurs: Klaudia Kuiper, Researcher, Vrije Universiteit Amsterdam (Pays-Bas) Maurice Pagel, Professeur, Université Paris Sud (France) - 2 - - 3 - Acknowledgements I would like to begin by thanking my supervisor Xavier Quidelleur without whom I would not have finished, with special thanks on the endless encouragement and patience, all the way through my PhD! Thank you all at GTSnext, especially to the directors Klaudia Kuiper, Jan Wijbrans and Frits Hilgen for creating such a great project. -
Sierra Club Members Papers
http://oac.cdlib.org/findaid/ark:/13030/tf4j49n7st No online items Guide to the Sierra Club Members Papers Processed by Lauren Lassleben, Project Archivist Xiuzhi Zhou, Project Assistant; machine-readable finding aid created by Brooke Dykman Dockter The Bancroft Library. University of California, Berkeley Berkeley, California, 94720-6000 Phone: (510) 642-6481 Fax: (510) 642-7589 Email: [email protected] URL: http://bancroft.berkeley.edu © 1997 The Regents of the University of California. All rights reserved. Note History --History, CaliforniaGeographical (By Place) --CaliforniaSocial Sciences --Urban Planning and EnvironmentBiological and Medical Sciences --Agriculture --ForestryBiological and Medical Sciences --Agriculture --Wildlife ManagementSocial Sciences --Sports and Recreation Guide to the Sierra Club Members BANC MSS 71/295 c 1 Papers Guide to the Sierra Club Members Papers Collection number: BANC MSS 71/295 c The Bancroft Library University of California, Berkeley Berkeley, California Contact Information: The Bancroft Library. University of California, Berkeley Berkeley, California, 94720-6000 Phone: (510) 642-6481 Fax: (510) 642-7589 Email: [email protected] URL: http://bancroft.berkeley.edu Processed by: Lauren Lassleben, Project Archivist Xiuzhi Zhou, Project Assistant Date Completed: 1992 Encoded by: Brooke Dykman Dockter © 1997 The Regents of the University of California. All rights reserved. Collection Summary Collection Title: Sierra Club Members Papers Collection Number: BANC MSS 71/295 c Creator: Sierra Club Extent: Number of containers: 279 cartons, 4 boxes, 3 oversize folders, 8 volumesLinear feet: ca. 354 Repository: The Bancroft Library Berkeley, California 94720-6000 Physical Location: For current information on the location of these materials, please consult the Library's online catalog. -
Geophysical Study of the San Juan Mountains Batholith Complex, Southwestern Colorado
Geophysical study of the San Juan Mountains batholith complex, southwestern Colorado Benjamin J. Drenth1,*, G. Randy Keller1, and Ren A. Thompson2 1ConocoPhillips School of Geology and Geophysics, 100 E. Boyd Street, University of Oklahoma, Norman, Oklahoma 73019, USA 2U.S. Geological Survey, MS 980, Federal Center, Denver, Colorado 80225, USA ABSTRACT contrast of the complex. Models show that coincident with the San Juan Mountains (Fig. 3). the thickness of the batholith complex var- This anomaly has been interpreted as the mani- One of the largest and most pronounced ies laterally to a signifi cant degree, with the festation of a low-density, upper crustal granitic gravity lows over North America is over the greatest thickness (~20 km) under the west- batholith complex that represents the plutonic rugged San Juan Mountains of southwest- ern SJVF, and lesser thicknesses (<10 km) roots of the SJVF (Plouff and Pakiser , 1972). ern Colorado (USA). The mountain range is under the eastern SJVF. The largest group of Whereas this interpretation remains essentially coincident with the San Juan volcanic fi eld nested calderas on the surface of the SJVF, unchallenged, new gravity data processing tech- (SJVF), the largest erosional remnant of a the central caldera cluster, is not correlated niques, digital elevation data, and constraints widespread mid-Cenozoic volcanic fi eld that with the thickest part of the batholith com- from seismic refraction studies (Prodehl and spanned much of the southern Rocky Moun- plex. This result is consistent with petrologic Pakiser , 1980) enable reassessment and improve- tains. A buried, low-density silicic batholith interpretations from recent studies that the ment of the previous model. -
Storm Data and Unusual Weather Phenomena
Storm Data and Unusual Weather Phenomena Time Path Path Number of Estimated April 1996 Local/ Length Width Persons Damage Location Date Standard (Miles) (Yards) Killed Injured Property Crops Character of Storm ALABAMA, North Central ALZ006 Madison 07 0100CST 0 0 0 0 Extreme Cold 1800CST The record low of 29 degrees was tied. ALZ024 Jefferson 10 0100CST 0 0 0 0 Extreme Cold 1800CST A new record low of 29 degrees was set at the Birmingham airport. ALZ006 Madison 10 0100CST 0 0 0 0 Extreme Cold 1800CST A new record low temperature of 30 degrees was set at the Huntsville International Airport. ALZ023 Tuscaloosa 10 0100CST 0 0 0 0 Extreme Cold 1800CST A new record low temperature of 30 degrees was set at the Tuscaloosa airport. Sumter County York 14 1627CST 0 0 10K 0 Hail (0.75) Hail up to three-quarters of an inch in diameter covered the ground near York. Greene County Eutaw 14 1627CST 0 0 10K 0 Hail (0.75) Three-quarter inch hail was reported by the Greene County Sheriff's Department. Pickens County Aliceville 14 1638CST 0.5 75 0 0 200K 0 Tornado (F1) 1642CST In Aliceville, two mobile homes were destroyed and 12 houses and two other buildings were damaged by falling trees. A nursing home roof was taken off and several cars were damaged by falling trees in what was apparently a tornado. Pickens County Carrollton to 14 1642CST 0 0 100K 0 Thunderstorm Wind (G56) 6 N Gordo 1705CST In Carrollton two homes and several cars were damaged by trees downed by the wind. -
Colorado Bighorn Sheep Management Plan 2009−2019
1 2 Special Report Number 81 3 COLORADO 4 BIGHORN SHEEP MANAGEMENT PLAN 5 2009−2019 6 J. L. George, R. Kahn, M. W. Miller, B. Watkins 7 February 2009 COLORADO DIVISION OF WILDLIFE 8 TERRESTRIAL RESOURCES 9 0 1 2 3 4 5 6 7 8 SPECIAL REPORT NUMBER 81 9 Special Report Cover #81.indd 1 6/24/09 12:21 PM COLORADO BIGHORN SHEEP MANAGEMENT PLAN 2009−2019 Editors1 J. L. George, R. Kahn, M. W. Miller, & B. Watkins Contributors1 C. R. Anderson, Jr., J. Apker, J. Broderick, R. Davies, B. Diamond, J. L. George, S. Huwer, R. Kahn, K. Logan, M. W. Miller, S. Wait, B. Watkins, L. L. Wolfe Special Report No. 81 February 2009 Colorado Division of Wildlife 1 Editors and contributors listed alphabetically to denote equivalent contributions to this effort. Thanks to M. Alldredge, B. Andree, E. Bergman, C. Bishop, D. Larkin, J. Mumma, D. Prenzlow, D. Walsh, M. Woolever, the Rocky Mountain Bighorn Society, the Colorado Woolgrowers Association, the US Forest Service, and many others for comments and suggestions on earlier drafts of this management plan. DOW-R-S-81-09 ISSN 0084-8875 STATE OF COLORADO: Bill Ritter, Jr., Governor DEPARTMENT OF NATURAL RESOURCES: Harris D. Sherman, Executive Director DIVISION OF WILDLIFE: Thomas E. Remington, Director WILDLIFE COMMISSION: Brad Coors, Chair, Denver; Tim Glenn, Vice Chair, Salida; Dennis Buechler, Secretary, Centennial; Members, Jeffrey A. Crawford; Dorothea Farris; Roy McAnally; John Singletary; Mark Smith; Robert Streeter; Ex Officio Members, Harris Sherman and John Stulp Layout & production by Sandy Cochran FOREWORD The Colorado Bighorn Sheep Management Plan is the culmination of months of work by Division of Wildlife biologists, managers and staff personnel. -
2017 Briefing Book Colorado Table of Contents Colorado Facts
U.S. Department of the Interior Bureau of Land Management 2017 Briefing Book Colorado Table of Contents Colorado Facts .......................................................................................................................................................................................... 1 Colorado Economic Contributions ..................................................................................................................................................... 2 History .................................................................................................................................................................................................. 3 Organizational Chart ........................................................................................................................................................................... 4 Branch Chiefs & Program Leads ........................................................................................................................................................ 5 Office Map ............................................................................................................................................................................................ 6 Colorado State Office ................................................................................................................................................................................ 7 Leadership ......................................................................................................................................................................................... -
Pollen Evidence of Floristic Turnover Forced by Cool Aridity During the Oligocene in Colorado GEOSPHERE; V
Research Paper GEOSPHERE Pollen evidence of floristic turnover forced by cool aridity during the Oligocene in Colorado GEOSPHERE; v. 15, no. 1 Estella B. Leopold and Stephanie Zaborac-Reed University of Washington, Department of Biology, Box 351800, Seattle, Washington 98195, USA https://doi.org/10.1130/GES01689.1 7 figures; 6 plates; 11 tables; ABSTRACT Manchester, 1997). In Colorado, the EOT is associated with a period of cooling 1 set of supplemental files and severe aridity lasting most of the Oligocene. One of our strongest contri- New pollen data from four Oligocene floras in volcanic landscapes of Colo butions is the addition of the pollen record from four Oligocene floras, which CORRESPONDENCE: eleopold@ uw.edu rado record important climatic shifts that reshaped the local flora and promoted had not been reported previously. This pollen record is an important aspect the development of subarid vegetation types. We combined new pollen data of this paper for assessing the total flora. The emphasis of this study is on the CITATION: Leopold, E.B., and Zaborac-Reed, S., 2019, Pollen evidence of floristic turnover forced by with previous megafossil evidence to assess vegetation changes during the evolutionary and climatic significance of the floristic changes during the EOT. cool aridity during the Oligocene in Colorado: Geo- Eocene–Oligocene Transition (EOT). Pollen data are the basis for updating Five Colorado floras of late Eocene through Oligocene age lie within the sphere, v. 15, no. 1, p. 254–294, https:// doi .org /10 the list of flora identified at Creede. Local extinctions in response to lower sum geographic mix of caldera and volcanic settings in the central Colorado vol- .1130 /GES01689.1.