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Historical Range of Variability and Current Landscape Condition Analysis: South Central Highlands Section, Southwestern Colorado & Northwestern New Mexico
Historical Range of Variability and Current Landscape Condition Analysis: South Central Highlands Section, Southwestern Colorado & Northwestern New Mexico William H. Romme, M. Lisa Floyd, David Hanna with contributions by Elisabeth J. Bartlett, Michele Crist, Dan Green, Henri D. Grissino-Mayer, J. Page Lindsey, Kevin McGarigal, & Jeffery S.Redders Produced by the Colorado Forest Restoration Institute at Colorado State University, and Region 2 of the U.S. Forest Service May 12, 2009 Table of Contents EXECUTIVE SUMMARY … p 5 AUTHORS’ AFFILIATIONS … p 16 ACKNOWLEDGEMENTS … p 16 CHAPTER I. INTRODUCTION A. Objectives and Organization of This Report … p 17 B. Overview of Physical Geography and Vegetation … p 19 C. Climate Variability in Space and Time … p 21 1. Geographic Patterns in Climate 2. Long-Term Variability in Climate D. Reference Conditions: Concept and Application … p 25 1. Historical Range of Variability (HRV) Concept 2. The Reference Period for this Analysis 3. Human Residents and Influences during the Reference Period E. Overview of Integrated Ecosystem Management … p 30 F. Literature Cited … p 34 CHAPTER II. PONDEROSA PINE FORESTS A. Vegetation Structure and Composition … p 39 B. Reference Conditions … p 40 1. Reference Period Fire Regimes 2. Other agents of disturbance 3. Pre-1870 stand structures C. Legacies of Euro-American Settlement and Current Conditions … p 67 1. Logging (“High-Grading”) in the Late 1800s and Early 1900s 2. Excessive Livestock Grazing in the Late 1800s and Early 1900s 3. Fire Exclusion Since the Late 1800s 4. Interactions: Logging, Grazing, Fire, Climate, and the Forests of Today D. Summary … p 83 E. Literature Cited … p 84 CHAPTER III. -
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. -
Abstracts, Posters and Program
Gold and Silver Deposits in Colorado Symposium Abstracts, posters And program Berthoud Hall, Colorado School of Mines Golden, Colorado July 20-24, 2017 GOLD AND SILVER DEPOSITS IN COLORADO SYMPOSIUM July 20-24, 2017 ABSTRACTS, POSTERS AND PROGRAM Principle Editors: Lewis C. Kleinhans Mary L. Little Peter J. Modreski Sponsors: Colorado School of Mines Geology Museum Denver Regional Geologists’ Society Friends of the Colorado School of Mines Geology Museum Friends of Mineralogy – Colorado Chapter Front Cover: Breckenridge wire gold specimen (photo credit Jeff Scovil). Cripple Creek Open Pit Mine panorama, March 10, 2017 (photo credit Mary Little). Design by Lew Kleinhans. Back Cover: The Mineral Industry Timeline – Exploration (old gold panner); Discovery (Cresson "Vug" from Cresson Mine, Cripple Creek); Development (Cripple Creek Open Pit Mine); Production (gold bullion refined from AngloGold Ashanti Cripple Creek dore and used to produce the gold leaf that was applied to the top of the Colorado Capital Building. Design by Lew Kleinhans and Jim Paschis. Berthoud Hall, Colorado School of Mines Golden, Colorado July 20-24, 2017 Symposium Planning Committee Members: Peter J. Modreski Michael L. Smith Steve Zahony Lewis C. Kleinhans Mary L. Little Bruce Geller Jim Paschis Amber Brenzikofer Ken Kucera L.J.Karr Additional thanks to: Bill Rehrig and Jim Piper. Acknowledgements: Far too many contributors participated in the making of this symposium than can be mentioned here. Notwithstanding, the Planning Committee would like to acknowledge and express appreciation for endorsements from the Colorado Geological Survey, the Colorado Mining Association, the Colorado Department of Natural Resources and the Colorado Division of Mine Safety and Reclamation. -
GIS and Geostatistical Analysis of the La Plata Mining District
GIS and Geostatistical Analysis of the La Plata Mining District David S. Schiowitz1, W. Scott White2, and Jeffrey A. Cary3 1GIS/CAD Specialist Bikis Water Consultants, LLC 555 RiverGate Lane, Suite B4-82 Durango, CO 81301 970-385-2340 [email protected] 2Associate Professor Department of Geosciences – Fort Lewis College 1000 Rim Drive Durango, CO 81301 970-247-7475 [email protected] 3Visiting Instructor Department of Geosciences – Fort Lewis College 1000 Rim Drive Durango, CO 81301 970-247-7620 [email protected] ABSTRACT The La Plata mining district is located in southwestern Colorado, and contains numerous gold, silver, and copper deposits. Geologic and structural data for the district was obtained from georeferencing and digitizing an historic geologic map. New stream sediment samples were collected at 41 locations throughout the area, and analyzed for metal concentrations. Using ArcGIS’s surface hydrologic modeling tools, individual watersheds were delineated upstream for each sediment sample location. A geodatabase has been created consisting of geologic formations and structures, veins, rock ages, historic mines, and geochemical anomalies associated with the 41 watersheds. The Spatial Analyst extension was used to analyze the data to aid in visualization and quantification of the relationships among geology, structure, and geochemistry. The results provide greater insight into regional geochemical domains of mineralization and in the modeling of spatial associations of known ore deposits within the mining district. 1 Introduction The objective of this project was to build a spatial database of structural, lithological, and geochemical data, so that a spatial model for gold exploration could be created. This model was created using the Fuzzy Logic Method developed by Graeme Bonham-Carter of the Geologic Survey of Canada, and Gary Reins of the USGS. -
Environmental Contaminant Exposure and Effects on Bats: Studies in Sichuan Province, China and Colorado, U.S.A
University of Northern Colorado Scholarship & Creative Works @ Digital UNC Dissertations Student Research 5-5-2017 Environmental Contaminant Exposure and Effects on Bats: Studies in Sichuan Province, China and Colorado, U.S.A. Laura Heiker Follow this and additional works at: https://digscholarship.unco.edu/dissertations Recommended Citation Heiker, Laura, "Environmental Contaminant Exposure and Effects on Bats: Studies in Sichuan Province, China and Colorado, U.S.A." (2017). Dissertations. 405. https://digscholarship.unco.edu/dissertations/405 This Text is brought to you for free and open access by the Student Research at Scholarship & Creative Works @ Digital UNC. It has been accepted for inclusion in Dissertations by an authorized administrator of Scholarship & Creative Works @ Digital UNC. For more information, please contact [email protected]. © 2017 LAURA HEIKER ALL RIGHTS RESERVED UNIVERSITY OF NORTHERN COLORADO Greeley, Colorado The Graduate School ENVIRONMENTAL CONTAMINANT EXPOSURE AND EFFECTS ON BATS: STUDIES IN SICHUAN PROVINCE, CHINA AND COLORADO, U.S.A. A Dissertation Submitted in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy Laura Heiker College of Natural and Health Sciences School of Biological Sciences Biological Education May 2017 This Dissertation by: Laura Heiker Entitled: Environmental Contaminant Exposure and Effects on Bats: Studies in Sichuan Province, China and Colorado, U.S.A. has been approved as meeting the requirements for the Degree of Doctor of Philosophy in College of Natural and Health Sciences in School of Biological Sciences, Program of Biological Education Accepted by the Doctoral Committee _______________________________________________________ Dr. Rick Adams, Ph.D., Research Advisor _______________________________________________________ Dr. Lauryn Benedict, Ph.D., Committee Member _______________________________________________________ Dr. -
The Proposed Montezuma Forest Reserve Colorado
THE PROPOSED MONTEZUMA FOREST RESERVE COLORADO ---- Examination, Report and Recommendations by Coert DuBois ---- Bureau of Forestry U. S. Department of Agriculture 1904 A facsimile of a copy acquired from the National Archives and Records Administration, Rocky Mountain Regional Office at Denver Federal Center December 2007 by David Bradford. 2 THE PROPOSED MONTEZUMA FOREST RESERVE, COLORADO ---- By Coert DuBois Forest Assistant, Forest Service ---- Location and Area The area included within the proposed Montezuma Forest Reserve lies in parts of San Miguel, Dolores, San Juan, La Plata, and Montezuma Counties in southwest Colorado, and includes the La Plata, Bear River, and San Miguel mountain ranges. The proposed boundaries include a total acreage of 570,260. Topography The mountains divide the area into three watersheds. On the north slope of the San Miguel Range are the headwaters of several small creeks which flow into the San Miguel River. The east slopes of the Bear River and La Plata Mountains are drained by Cascade, Hermosa, and Junction Creeks, all tributaries of the Animas River. The most important division is the drainage basin of the Mancos and Dolores Rivers, or the south and west slopes of the mountains. The heads of the Mancos River rise high up in the La Plata Mountains and consist of three forks fed by many smaller creeks, which join and form the main Mancos near the south boundary. A low mesa divides the waters of the Mancos from those of the Dolores. The Dolores River, the most important in the southwest part of the State, with the exception of the San Juan, has its sources in all three ranges, being fed by a great many mountain streams, the chief of which are the West Fork, Bear Creek, Beaver Creek, and Lost Canon Creek. -
River Flowing from the Sunrise: an Environmental History of the Lower San Juan
Utah State University DigitalCommons@USU All USU Press Publications USU Press 2000 River Flowing from the Sunrise: An Environmental History of the Lower San Juan James M. Aton Robert S. McPherson Follow this and additional works at: https://digitalcommons.usu.edu/usupress_pubs Recommended Citation Aton, James M. and McPherson, Robert S., "River Flowing from the Sunrise: An Environmental History of the Lower San Juan" (2000). All USU Press Publications. 128. https://digitalcommons.usu.edu/usupress_pubs/128 This Book is brought to you for free and open access by the USU Press at DigitalCommons@USU. It has been accepted for inclusion in All USU Press Publications by an authorized administrator of DigitalCommons@USU. For more information, please contact [email protected]. River Flowing from the Sunrise An Environmental History of the Lower San Juan A. R. Raplee’s camp on the San Juan in 1893 and 1894. (Charles Goodman photo, Manuscripts Division, Marriott Library, University of Utah) River Flowing from the Sunrise An Environmental History of the Lower San Juan James M. Aton Robert S. McPherson Utah State University Press Logan, Utah Copyright © 2000 Utah State University Press all rights reserved Utah State University Press Logan, Utah 84322-7800 Manfactured in the United States of America Printed on acid-free paper 654321 000102030405 Library of Congress Cataloging-in-Publication Data Aton, James M., 1949– River flowing from the sunrise : an environmental history of the lower San Juan / James M. Aton, Robert S. McPherson. p. cm. Includes bibliographical references and index. ISBN 0-87421-404-1 (alk. paper) — ISBN 0-87421-403-3 (pbk. -
Geology and Ore Deposits of the La Plata District, Colorado Eckel, Edwin B
New Mexico Geological Society Downloaded from: http://nmgs.nmt.edu/publications/guidebooks/19 Geology and ore deposits of the La Plata district, Colorado Eckel, Edwin B. with sections by Williams, J. S. and Galbraith, F. W. Digest prepared by Trauger, F. D., 1968, pp. 41-62 in: San Juan, San Miguel, La Plata Region (New Mexico and Colorado), Shomaker, J. W.; [ed.], New Mexico Geological Society 19th Annual Fall Field Conference Guidebook, 212 p. This is one of many related papers that were included in the 1968 NMGS Fall Field Conference Guidebook. Annual NMGS Fall Field Conference Guidebooks Every fall since 1950, the New Mexico Geological Society (NMGS) has held an annual Fall Field Conference that explores some region of New Mexico (or surrounding states). Always well attended, these conferences provide a guidebook to participants. Besides detailed road logs, the guidebooks contain many well written, edited, and peer-reviewed geoscience papers. These books have set the national standard for geologic guidebooks and are an essential geologic reference for anyone working in or around New Mexico. Free Downloads NMGS has decided to make peer-reviewed papers from our Fall Field Conference guidebooks available for free download. Non-members will have access to guidebook papers two years after publication. Members have access to all papers. This is in keeping with our mission of promoting interest, research, and cooperation regarding geology in New Mexico. However, guidebook sales represent a significant proportion of our operating budget. Therefore, only research papers are available for download. Road logs, mini-papers, maps, stratigraphic charts, and other selected content are available only in the printed guidebooks. -
Geography and Physiography
General Geology by Whitman Cross, assisted toy Arthur Coe Spencer. Economic Geology by Chester Wells Puriiigton. GEOGRAPHY AND PHYSIOGRAPHY. several of its branches have cut into or across the Banded Mountain is a term used in one or two which has been recently cut through a forest cov^ broken mesa, causing much diversity in the places by Holmes as an alternative for Hesperus ering into brecciated rock, in which erosion is now GENERAL RELATIONS. topography. Peak, but as the latter was finally placed upon proceeding at a rapid rate. Geographic position. The La Plata quadrangle Culture. - -The La Plata Mountains have been the Hayden map and was generally used through Bear Greek. The basin head of this stream is situated in southwestern Colorado, near the found to contain metalliferous deposits, and in the out the Hayden reports, the other name is applied overlaps the extreme head of the La Plata for 1^ State line, as is shown by the index map on development of mining operations a small town, to the summit of similar character north of miles and is excavated in the stocks of Diorite the title page of this folio. It is bounded by named La Plata, has grown up in the heart of the Mount Moss. Peak and Mount Moss and of the indurated and _ meridians 108° and 108° 15' west longi-o ExtentD . and. mountains. The Rio Grande Southern Towns, The other names on the map are those of local metamorphosed strata between them. Polished tude and parallels 37° 15' and 37° 30' drainage- Railroad crosses the quadrangle south usage as far as that could be ascertained. -
Pioneers, Prospectors and Trout a Historic Context for La Plata County, Colorado
Pioneers, Prospectors and Trout A Historic Context For La Plata County, Colorado By Jill Seyfarth And Ruth Lambert, Ph.D. January, 2010 Pioneers, Prospectors and Trout A Historic Context For La Plata County, Colorado Prepared for the La Plata County Planning Department State Historical Fund Project Number 2008-01-012 Deliverable No. 7 Prepared by: Jill Seyfarth Cultural Resource Planning PO Box 295 Durango, Colorado 81302 (970) 247-5893 And Ruth Lambert, PhD. San Juan Mountains Association PO Box 2261 Durango, Colorado 81302 January, 2010 This context document is sponsored by La Plata County and is partially funded by a grant from the Colorado State Historical Fund (Project Number 2008-01-012). The opinions expressed in this report do not necessarily reflect the opinions or policies of the staff of the Colorado State Historical Fund. Cover photographs: Top-Pine River Stage Station. Photo Source: La Plata County Historical Society-Animas Museum Photo Archives. Left side-Gold King Mill in La Plata Canyon taken in about1936. Photo Source Plate 21, in U.S.Geological Survey Professional paper 219. 1949 Right side-Local Fred Klatt’s big catch. Photo Source La Plata County Historical Society- Animas Museum Photo Archives. Table of Contents Introduction ................................................................................................................... 1 New Frontiers................................................................................................................ 3 Initial Exploration ............................................................................................ -
Upper Colorado River and Its Utilization
UNITED STATES DEPARTMENT OF THE INTERIOR Ray Lyman Wilbur, Secretary GEOLOGICAL SURVEY George Otts Smith, Director Water-Supply Paper 617 UPPER COLORADO RIVER AND ITS UTILIZATION BY ROBERT FOLLANSBEE f UNITED STATES GOVERNMENT PRINTING OFFICE WASHINGTON : 1929 For sale by the Superintendent of Documents, Washington, D. C. - * ' Price 85 cents CONTENTS Preface, by Nathan C. Grover______________________ ____ vn .Synopsis of report.-____________________________________ xi Introduction_________________________________________ 1 Scope of report--------__---__-_____--___--___________f__ 1 Index system____________________________________ _ ______ 2 Acknowledgments.._______-________________________ __-______ 3 Bibliography _ _________ ________________________________ 3 Physical features of basin________________-________________-_____-__ 5 Location and accessibility______--_________-__________-__-_--___ 5 Topography________________________________________________ 6 Plateaus and mountains__________________________________ 6 The main riyer_________________________________________ 7 Tributaries above Gunnison River_._______________-_-__--__- 8 Gunnison River_----_---_----____-_-__--__--____--_-_----_ IS Dolores Eiver____________________._______________________ 17 Forestation__________________ ______._.____________________ 19 Scenic and recreational features_-__-__--_____-__^--_-__________ 20 General features________________________.______--__-_--_ 20 Mountain peaks_________--_.__.________________________ 20 Lakes....__._______________________________ -
Seniors Outdoors! Summer 2010 Outing Schedule
Seniors Outdoors! Summer 2010 Outing Schedule Outing Description Day, Date, Difficulty E-mail schedule changes and updates to: [email protected]. Departure Time Rating, & Total Length Meeting place abbreviations: ACP: Animas City Park TC: Trimble Crossing Departure & Tam: Tamarron DMR: Durango Mountain Resort RC: Rec Center Place Elevation SRP: Santa Rita Park Gain Schedule changes and trip updates are in red on online schedule. Wed June 9 WW hike: Telegraph to Pautsky Point. The trail begins by following the old Moderate 8:30 am Horse Gulch road, now closed to traffic, and links another trail that goes 6 miles 3rd & 8th Street through a meadow before connecting with the Telegraph Hill where the trail 1,000’ Horse Gulch then ascends to Pautsky Point. The trail is well marked and most elevation Trailhead gain is from the start of the trail up Telegraph Hill. Leader Dennis Aronson 259-5045 RSVP non-members only Thurs June 10 Hike the Dry Fork – Hoffhein Connection Loop. A pretty loop hike with Moderate 8:00 am consistent and mostly gradual elevation gain up to the Colorado Trail and a 8.5 miles SRP slightly steeper return on Hoffhein Connection with views of Perins Peak, 1,290’ Barnroof Point and the La Plata Mountains . Carpool $1. Dogs OK. RSVP Leader David Wright 259-5978 [email protected] Fri June 11 Cave Basin Trail to Emerald Lake Overlook. The trail starts north east of Hard 8:30 am Vallecito off of Middle Mountain Road. We will climb through fairly open, 9 miles ACP exposed alpine Meadows to an unnamed ridge overlooking Dollar and 1,600’ Emerald Lakes to the east.