Foundation Document Overview Colorado National Monument Colorado

Total Page:16

File Type:pdf, Size:1020Kb

Foundation Document Overview Colorado National Monument Colorado NATIONAL PARK SERVICE • U.S. DEPARTMENT OF THE INTERIOR Foundation Document Overview Colorado National Monument Colorado © Darlyne Merkel Contact Information For more information about the Colorado National Monument Foundation Document, contact: [email protected] or (970) 858-3617 ext. 300 or write to: Superintendent, Colorado National Monument, 1750 Rim Rock Drive, Fruita, CO 81521-0001 Purpose Significance Significance statements express why Colorado National Monument resources and values are important enough to merit national park unit designation. Statements of significance describe why an area is important within a global, national, regional, and systemwide context. These statements are linked to the purpose of the park unit, and are supported by data, research, and consensus. Significance statements describe the distinctive nature of the park and inform management decisions, focusing efforts on preserving and protecting the most important resources and values of the park unit. • Colorado National Monument exposes and preserves three different groups of rock and sediment—the first is the Early to Middle Proterozoic gneiss and schist; then the horizontally bedded Mesozoic sedimentary rocks; and the youngest being the various types of Quaternary deposits such as alluvium, colluvium, and dunes reflecting two billion years of Earth history. Wind and water erosion continues OLORADO ATIONAL The purpose of C N to form and reveal spectacular land forms and viewsheds MONUMENt is to provide for the of canyons, plateaus, and towering monoliths at the preservation, understanding, and northeastern gateway of the Colorado Plateau. enjoyment of its natural and cultural • Colorado National Monument preserves and protects resources as showcased by its representative examples of intact high desert ecosystems extraordinary erosional, geological, of the Colorado Plateau, providing opportunities for scientific studies. and historical landscapes reflective of • Colorado National Monument preserves and protects the northern Colorado Plateau and of cultural, physical, paleontological, biological, and geological great scientific interest. resources and values for education, interpretation, and enjoyment within a growing urban community. Fundamental Resources and Values & Other Important Resources and Values • Human History. The continuum of human use and cultural ties are revealed by rock art, lithic scatters, and historic trails and routes of ancestral peoples including the Archaic, Fremont, and Ute tribes, informing the rich and diverse museum collections of Colorado National Monument. Other historic cultural resources such as Civilian Conservation Corps (CCC) and Mission 66 structures, artifacts, and stories serve to document the more recent time line of human history in the monument. • Rim Rock Drive. The idea of a roadway along the rim of the red rock canyons was a rallying point for local support that led to the preservation of the national monument. As a road engineering masterpiece of the Great Depression era, Rim Rock Drive has earned its listing in the National Register of Historic Places. The scenic roadway is inseparable from the identity of the monument, providing the primary platform from which visitors can experience, understand, and appreciate the beauty of the monument. • Scenery. The striking and colorfully sculpted canyons, Fundamental resources and values are those features, systems, monoliths, rock formations, and distant views of the processes, experiences, stories, scenes, sounds, smells, or other attributes determined to merit primary consideration during Grand Valley, Book Cliffs, and Grand Mesa along with planning and management processes because they are essential to the Colorado River, encompass a visual beauty that stirs achieving the purpose of the park and maintaining its significance. imaginations, forges individual connections between people and the monument, and is embedded in the • Geologic Processes. The magnificent scenery, character and identity of Colorado’s Western Slope. beauty of the monument are the result of geologic processes in many forms, including sedimentation, faulting, uplift, erosion, Colorado National Monument contains other resources landslides, rockfalls, and flash floods. Geologic processes and values that may not be fundamental to the purpose dominate all other natural processes acting on the monument and significance of the park, but are important to consider landscape. in management and planning decisions. These are referred • Geologic Features. The abundant geologic features to as other important resources and values. preserved at Colorado National Monument provide an ideal • Wilderness. The monument encompasses some 20,000 outdoor lab for ongoing scientific study of the geology of acres, of which approximately 15,000 acres have been the Colorado Plateau. Particularly notable are the hanging identified or proposed as wilderness and serve as a canyons (U-shaped valleys), rock layers that record geologic refuge for self-discovery, solitude, and natural quiet. history, distinctive monoliths and canyons, and the Great The wilderness acreage is still under congressional Unconformity (1.2 billion years of absent rock history). consideration and is managed under NPS policy as a • Ecological Systems. The species, landscapes, and related wilderness until formally designated by Congress. attributes so highly valued by monument visitors and society • Diversity of Visitor Experiences. Colorado National at large cannot be preserved without also conserving the Monument’s proximity to an urban setting provides ecological systems of which they are a part. Some of the key opportunities for a diversity of visitor experiences components of the system are eco-regional distinctiveness through education, interpretation, and recreation. (old-growth pinyon-juniper forest, hanging gardens), ecological functionality (air, water, and hydrological processes; biological soil crusts; riparian and wetland ecosystems); and native grasslands and sagebrush shrublands. Description Colorado National Monument preserves one of the grand Around 440,000 people per year visit Colorado National landscapes of the American West. Sheer-walled canyons, Monument to enjoy these and other opportunities. towering monoliths, colorful formations, desert bighorn The monument encompasses some 20,000 acres, of sheep, soaring eagles, and a spectacular road reflect the which approximately 15,000 acres has been identified or environment and history of the plateau and canyon country. proposed as wilderness and serves as a refuge for self- Historic Rim Rock Drive offers 23 miles of breathtaking discovery, solitude, and natural quiet. The wilderness panoramic views and numerous scenic overlooks. Trails lead acreage is still under congressional consideration and is across mesa tops and into backcountry canyons. Picnicking managed under NPS policy as a wilderness until formally Some land outside the park Trail Overlook 7mi Distance along Ranger station Campground boundary is privately owned. 11km Rim Rock Drive and camping are available. At an average elevationPlease respect the owne ofrs’ 6,000 designated by Congress. rights and do not trespass. Access gate Unpaved road Wheelchair-accessible Picnic area feet at the rim, the climate is To Fruita and 70 (exit 19) 2mi West Entrance to North relatively mild, but can change 4km Grand Junction 12mi 0 0.5 km 1 19km rapidly to snow or summer storms. 0 0.5 mile 1 Historic Trails View West (Fruita) Entrance 6 4690ft 50 N O 1430m Y N Tunnels A Redlands View C N 340 S O Dead Mans Curve L Y 4mi E N D 7km C A O C D K R A Exit 26 A IZ IT L U Distant View R F Saddlehorn 70 Balanced B Balanced Rock View r Rock o a d Fruita Canyon View Window Rock w a Window Rock Trail y 6 Book Cliffs View 50 Sentinel Spire C Visitor Center O n Tra THE o il L N y O Park Headquarters O ISLAND n Y R 5787 ft Saddlehorn Pipe N a A R C D E A ent 1764 m Canyon Organ C m O I V u R l n Rim Trail ai G o Tr IN M to’s DD Alcove Ot E Nature Trail W Independence Mushroom Rock To Independence Monument Grand Monument View Junction Rd 4 Grand View / M 3 3/ Kissing E 4 Rd 20 O N South Half Couple O Broadway N White Y Rd y Tunnel N 2 Rocks / a U A 1 C w k M R Broadway 20 r A a T P S E D T s N L d B Monument H n l O a E la T G c d k Canyon View e R C B .C .C E McINNIS R . T N i d r a C g i l H CANYONS e Coke Ovens Overlook T Riggs Hill 340 NATIONAL r C a Coke Ovens Trail A i l Coke Ovens N CONSERVATION Y O South Broadway AREA Artists Point N E d To G o o Grand D I Squaw Fingers w e Ottos Bathtub d iv Junction R 7mi il r D 11km W K C A South Camp Road L B MONUMENT rail T y Cap rt Highland View e ib Corkscrew To L Connector Rattlesnake MESA Trail Canyon COLORADO NATIONAL MONUMENT Bla Liberty Cap ck Ridg e Road 6479ft 1975m N Corkscrew O Y Trail N A To C Grand UTE Junction C Suction Point E 4mi R A T 6km im N Y U R O oc N d k D Upper Ute Canyon East R 2 r / (Grand Junction) 1 i v Overlook 6 d 1 e Entrance a / o d 4930ft R a t o nyo 1503m n n R a T C e Fallen Rock Overlook ra N k e i O r l t Y N m a U N O u P A C Y n e Fallen N Devils Kitchen o d D Rock E A M a R 4mi l Picnic Area C G 7km S t Se s U rp e en Red Canyon B ts W Trai M Tunnel l Overlook U L Dogs O Cold Ute Canyon C Shivers Tooth 8mi View Point Devils E 12km Kitchen C 6198ft Trail H 1889m Devils O Kitchen C A N Highest point on Rim Rock Drive Y l O 6640ft i a r N 2024m T n o rd Waterfall o G d l O N YO AN C Road Waterfall d/DS E oa R R A rk F Pa H e G ad U Gl st RO Ea THO NO Glade Park (community) To d Grand oa Junction S R oad/C e Park R Littl No Thoroughfare Canyon Trail Park Ro le ad itt /CS ANYON L R C o ROUGH a d .
Recommended publications
  • New Core Study Unearths Insights Into Uinta Basin Evolution and Resources
    UTAH GEOLOGICAL SURVEY SURVEY NOTES VOLUME 51, NUMBER 2 MAY 2019 New core study unearths insights into Uinta Basin evolution and resources CONTENTS New Core, New Insights into Ancient DIRECTOR’S PERSPECTIVE Lake Uinta Evolution and Uinta Basin • Exploration and development of Energy Resources ..........................1 by Bill Keach unconventional resources. Oil shale Drones for Good: Utah Geologists As the incoming Take to the Skies ...........................3 director for the Utah and sand continue to be a provocative Utah Mining Districts at Your Fingertips . .4 Geological Survey opportunity still searching for an eco- Energy News: The Benefits of Utah (UGS), I would like to nomic threshold. Oil and Gas Production.....................6 thank Rick Allis for his Glad You Asked: What are Those • Earthquake early warning systems. Can Blue Ponds Near Moab?....................8 guidance and leader- they work on the Wasatch Front? GeoSights: Pine Park and Ancient ship over the past 18 years. In Rick’s first • Incorporating technology into field Supervolcanoes of Southwestern Utah....10 “Director’s Perspective” he made predic- Survey News...............................12 tions of “likely hot-button issues” that the mapping and hazard recognition and UGS would face. These issues included: using data analytics and knowledge Design | Jenny Erickson sharing in our work at the UGS. Cover | View to the west of Willow Creek • Renewed exploration for oil and gas in core study area. Photo by Ryan Gall. the State. The last item is dear to my heart. A large part of my career has been in the devel- State of Utah • Renewed interest in more fossil-fuel-fired Gary R.
    [Show full text]
  • The Tectonic Evolution of the Madrean Archipelago and Its Impact on the Geoecology of the Sky Islands
    The Tectonic Evolution of the Madrean Archipelago and Its Impact on the Geoecology of the Sky Islands David Coblentz Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM Abstract—While the unique geographic location of the Sky Islands is well recognized as a primary factor for the elevated biodiversity of the region, its unique tectonic history is often overlooked. The mixing of tectonic environments is an important supplement to the mixing of flora and faunal regimes in contributing to the biodiversity of the Madrean Archipelago. The Sky Islands region is located near the actively deforming plate margin of the Western United States that has seen active and diverse tectonics spanning more than 300 million years, many aspects of which are preserved in the present-day geology. This tectonic history has played a fundamental role in the development and nature of the topography, bedrock geology, and soil distribution through the region that in turn are important factors for understanding the biodiversity. Consideration of the geologic and tectonic history of the Sky Islands also provides important insights into the “deep time” factors contributing to present-day biodiversity that fall outside the normal realm of human perception. in the North American Cordillera between the Sierra Madre Introduction Occidental and the Colorado Plateau – Southern Rocky The “Sky Island” region of the Madrean Archipelago (lo- Mountains (figure 1). This part of the Cordillera has been cre- cated between the northern Sierra Madre Occidental in Mexico ated by the interactions between the Pacific, North American, and the Colorado Plateau/Rocky Mountains in the Southwest- Farallon (now entirely subducted under North America) and ern United States) is an area of exceptional biodiversity and has Juan de Fuca plates and is rich in geology features, including become an important study area for geoecology, biology, and major plateaus (The Colorado Plateau), large elevated areas conservation management.
    [Show full text]
  • Controls on Geothermal Activity in the Sevier Thermal Belt, Southwestern
    PROCEEDINGS, 44th Workshop on Geothermal Reservoir Engineering Stanford University, Stanford, California, February 11-13, 2019 SGP-TR-214 Controls of Geothermal Resources and Hydrothermal Activity in the Sevier Thermal Belt Based on Fluid Geochemistry Stuart F. Simmons1,2, Stefan Kirby3, Rick Allis3, Phil Wannamaker1 and Joe Moore1 1EGI, University of Utah, 423 Wakara Way, suite 300, Salt Lake City, UT 2Department of Chemical Engineering, University of Utah, 50 S. Central Campus Dr., Salt Lake City, UT 84112 3Utah Geological Survey, 1594 W. North Temple St., Salt Lake City, UT 84114 [email protected] Keywords: Sevier Thermal Belt, hydrothermal systems, heat flow, geochemistry, helium isotopes, stable isotopes. ABSTRACT The Sevier Thermal Belt, southwestern Utah, covers 20,000 km2, and it is located along the eastern edge of the Basin and Range, extending east into the transition zone of the Colorado Plateau. The belt encompasses the geothermal production fields at Cove Fort, Roosevelt Hot Springs, and Thermo, scattered hot spring activity, and the Covenant & Providence hydrocarbon fields. Regionally, it is characterized by elevated heat flow, modest seismicity, and Quaternary basalt-rhyolite magmatism. There are at least five large discrete domains (50 to >500 km2) with anomalous heat flow, including ones associated with Roosevelt Hot Springs, Cove Fort, Thermo and the Black Rock desert. Helium isotope data indicate connections to the upper mantle are developed over the region of strongest and most concentrated hydrothermal activity. By contrast, stable isotope data demonstrate that most of the convective heat transfer is associated with shallow to deep circulation of local meteoric water. Quartz-silica geothermometry suggests that convective heat transfer is compartmentalized by stratigraphic horizons and sub-vertical faults.
    [Show full text]
  • Chapter 3 of the State Wildlife Action Plan
    Colorado’s 2015 State Wildlife Action Plan Chapter 3: Habitats This chapter presents updated information on the distribution and condition of key habitats in Colorado. The habitat component of Colorado’s 2006 SWAP considered 41 land cover types from the Colorado GAP Analysis (Schrupp et al. 2000). Since then, the Southwest Regional GAP project (SWReGAP, USGS 2004) has produced updated land cover mapping using the U.S. National Vegetation Classification (NVC) names for terrestrial ecological systems. In the strictest sense, ecological systems are not equivalent to habitat types for wildlife. Ecological systems as defined in the NVC include both dynamic ecological processes and biogeophysical characteristics, in addition to the component species. However, the ecological systems as currently classified and mapped are closely aligned with the ways in which Colorado’s wildlife managers and conservation professionals think of, and manage for, habitats. Thus, for the purposes of the SWAP, references to the NVC systems should be interpreted as wildlife habitat in the general sense. Fifty-seven terrestrial ecological systems or altered land cover types mapped for SWReGAP have been categorized into 20 habitat types, and an additional nine aquatic habitats and seven “Other” habitat categories have been defined. SWAP habitat categories are listed in Table 4 (see Appendix C for the crosswalk of SWAP habitats with SWReGAP mapping units). Though nomenclature is slightly different in some cases, the revised habitat categories presented in this document
    [Show full text]
  • Geology of the Northern Portion of the Fish Lake Plateau, Utah
    GEOLOGY OF THE NORTHERN PORTION OF THE FISH LAKE PLATEAU, UTAH DISSERTATION Presented in Partial Fulfillment of the Requirements for the Degree Doctor of Philosophy in the Graduate School of The Ohio State - University By DONALD PAUL MCGOOKEY, B.S., M.A* The Ohio State University 1958 Approved by Edmund M." Spieker Adviser Department of Geology CONTENTS Page INTRODUCTION. ................................ 1 Locations and accessibility ........ 2 Physical features ......... _ ................... 5 Previous w o r k ......... 10 Field work and the geologic map ........ 12 Acknowledgements.................... 13 STRATIGRAPHY........................................ 15 General features................................ 15 Jurassic system......................... 16 Arapien shale .............................. 16 Twist Gulch formation...................... 13 Morrison (?) formation...................... 19 Cretaceous system .............................. 20 General character and distribution.......... 20 Indianola group ............................ 21 Mancos shale. ................... 24 Star Point sandstone................ 25 Blackhawk formation ........................ 26 Definition, lithology, and extent .... 26 Stratigraphic relations . ............ 23 Age . .............................. 23 Price River formation...................... 31 Definition, lithology, and extent .... 31 Stratigraphic relations ................ 34 A g e .................................... 37 Cretaceous and Tertiary systems . ............ 37 North Horn formation. ..........
    [Show full text]
  • Pine River Project D2
    Pine River Project Wm. Joe Simonds Bureau of Reclamation 1994 Table of Contents The Pine River Project..........................................................2 Project Location.........................................................2 Historic Setting .........................................................3 Pre-Historic Era...................................................3 Historic Era ......................................................3 Project Authorization.....................................................7 Construction History .....................................................8 Investigations.....................................................8 Construction......................................................8 Post Construction History ................................................14 Settlement of Project Lands ...............................................18 Uses of Project Water ...................................................19 Conclusion............................................................20 About the Author .............................................................20 Bibliography ................................................................21 Archival Collections ....................................................21 Government Documents .................................................21 Magazine Articles ......................................................21 Correspondence ........................................................21 Other Sources..........................................................22
    [Show full text]
  • Desert Semidesert* Upland* Mountain
    MLRA 35 - Colorado and Green River Plateaus MLRA 35 - Colorado and Green River Plateaus (Utah portion) Ecological Zone Desert Semidesert* Upland* Mountain Precipitation 5 -9 inches 9 -13 inches 13-16 inches Elevation 3,000 -5,000 4,500 -6,500 5,800 - 7,000 NONE Soil Moisture Regime Typic Ardic Ustic Aridic Aridic Ustic Soil Temp Regime Mesic/Thermic Mesic Mesic Freeze free Days 120-220 120-160 100-130 Percent of Pinyon Percent of Juniper production is Shadscale and production is usually usually greater than blackbrush Notes greater than the Pinyon the Juniper production production 300 – 500 lbs/ac 400 – 700 lbs/ac 100 – 500 lbs/ac 800 – 1,000 lbs/ac *the aspect (north or south) can greatly influence site characteristics. All values in this table are approximate and should be used as guidelines. Different combinations of temperature, precipitation and soil type can place an ecological site into different zones. Rocky Mountains Major Land ResourceBasins and Plateaus Area (MLRA) D35 D36 - Southwestern Plateaus, Mesas, and Foothills D35 - Colorado Plateau Desert 07014035 Miles 35—Colorado Plateau This area is in Arizona (56 percent), Utah (22 percent), New Mexico (21 percent), and Colorado (1 percent). It makes up about 71,735 square miles (185,885 square kilometers). The cities of Kingman and Winslow, Arizona, Gallup and Grants, New Mexico, and Kanab and Moab, Utah, are in this area. Interstate 40 connects some of these cities, and Interstate 17 terminates in Flagstaff, Arizona, just outside this MLRA. The Grand Canyon and Petrified Forest National Parks and the Canyon de Chelly and Wupatki National Monuments are in the part of this MLRA in Arizona.
    [Show full text]
  • Colorado Plateau
    MLRA 36 – Southwestern Plateaus, Mesas and Foothills MLRA 36 – Southwestern Plateaus, Mesas and Foothills (Utah portion) Ecological Zone Desert Semidesert* Upland* Mountain* Precipitation 5 -9 inches 9 -13 inches 13-16 inches 16-22 inches Elevation 3,000 -5,000 4,500 -6,500 5,800 - 7,000 6,500 – 8,000 Soil Moisture Regime Ustic Aridic Ustic Ustic Ustic Soil Temp Regime Mesic Mesic Mesic Frigid Freeze free Days 120-220 120-160 100-130 60-90 Percent of Pinyon Percent of Juniper production is Shadscale and production is usually usually greater than blackbrush Notes greater than the Pinyon the Juniper Ponderosa Pine production production 300 – 500 lbs/ac 400 – 700 lbs/ac 100 – 500 lbs/ac 800 – 1,000 lbs/ac *the aspect (north or south) can greatly influence site characteristics. All values in this table are approximate and should be used as guidelines. Different combinations of temperature, precipitation and soil type can place an ecological site into different zones. Southern Major Land Resource AreasRocky (MLRA) D36 Mountains Basins and Plateaus s D36 - Southwestern Plateaus, Mesas, and Foothills Colorado Plateau 05010025 Miles 36—Southwestern Plateaus, Mesas, and Foothills This area is in New Mexico (58 percent), Colorado (32 percent), and Utah (10 percent). It makes up about 23,885 square miles (61,895 square kilometers). The major towns in the area are Cortez and Durango, Colorado; Santa Fe and Los Alamos, New Mexico; and Monticello, Utah. Grand Junction, Colorado, and Interstate 70 are just outside the northern tip of this area. Interstates 40 and 25 cross the middle of the area.
    [Show full text]
  • 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 ............................................................................................
    [Show full text]
  • Dextral Shear Along the Eastern Margin of the Colorado Plateau: a Kinematic Link Between Laramide Contraction and Rio Grande Rifting (Ca
    Dextral Shear along the Eastern Margin of the Colorado Plateau: A Kinematic Link between Laramide Contraction and Rio Grande Rifting (Ca. 75–13 Ma) Author(s): Tim F. Wawrzyniec, John W. Geissman, Marc D. Melker, and Mary Hubbard Source: The Journal of Geology, Vol. 110, No. 3 (May 2002), pp. 305-324 Published by: The University of Chicago Press Stable URL: http://www.jstor.org/stable/10.1086/339534 . Accessed: 02/06/2014 15:34 Your use of the JSTOR archive indicates your acceptance of the Terms & Conditions of Use, available at . http://www.jstor.org/page/info/about/policies/terms.jsp . JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact [email protected]. The University of Chicago Press is collaborating with JSTOR to digitize, preserve and extend access to The Journal of Geology. http://www.jstor.org This content downloaded from 129.123.127.4 on Mon, 2 Jun 2014 15:34:30 PM All use subject to JSTOR Terms and Conditions Dextral Shear along the Eastern Margin of the Colorado Plateau: A Kinematic Link between Laramide Contraction and Rio Grande Rifting (Ca. 75–13 Ma) Tim F. Wawrzyniec,1 John W. Geissman, Marc D. Melker,2 and Mary Hubbard3 Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, New Mexico 87131, U.S.A. (e-mail: [email protected]) ABSTRACT Kinematic data associated with both Laramide-age and -style and Rio Grande rift-related structures show that the latest Cretaceous to Neogene interaction between the Colorado Plateau and the North American craton was domi- nantly coupled with a component of dextral shear.
    [Show full text]
  • The Great Basin-Colorado Plateau Transition in Central Utah
    Utah Geological Association Publication 30 - Pacific Section American Association of Petroleum Geologists Publication GB78 1 GREAT BASIN-COLORADO PLATEAU TRANSITION IN CENTRAL UTAH: AN INTERFACE BETWEEN ACTIVE EXTENSION AND STABLE INTERIOR PHILIP E. WANNAMAKER1, JOHN M. BARTLEY2, ANNE F. SHEEHAN3, CRAIG H. JONES3, ANTHONY R. LOWRY4, TREVOR A. DUMITRU5, TODD A. EHLERS2, W. STEVEN HOLBROOK6, G. LANG FARMER3, MARTYN J. UNSWORTH7, DARRELL B. HALL2, DAVID S. CHAPMAN2, DAVID A. OKAYA8, BARBARA E. JOHN6, AND JACK A. WOLFE9 ABSTRACT A fundamental tectonic boundary appears to have existed below the site of the present-day Colorado Plateau to Great Basin Transition Zone since Precambrian times. The Plateau proper has seen little deformation since Middle Proterozoic conti- nental assembly apart from Cenozoic uplift and limited thick-skinned contraction and calc-alkaline plutonism. In contrast, the Great Basin region has been subject to repeated episodes of both contractional and extensional tectonism, and extensional activity continues into the modern day. Evidence exists that the Colorado Plateau at its western margin is being converted to lithosphere with rifted Great Basin properties. Some models for migrating extension call upon progressive gravitational collapse of thicker crust of the plateau margin as it warms, possibly aided by hardening of the previously rifted lithosphere (i.e., Great Basin interior) via crustal thinning and cooling. However, this rather homogeneous and temporally gradual model of deformation has only partial applicability to evolu- tion of the western Colorado Plateau and eastern Great Basin. On the one hand, the limited degree of block style faulting, high elevation, and high apparent elastic thickness of the Transition Zone resemble properties of the Colorado Plateau.
    [Show full text]
  • Assessment of the Mineral Potential of Public Lands Located Within Proposed Solar Energy Zones in Colorado
    1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 1 1 2 3 4 5 6 7 8 9 10 11 12 13 Colorado SEZ Mineral Assessment July 2012 CONTENTS NOTATION .............................................................................................................................. vii SIGNATURE PAGE ................................................................................................................ ix SUMMARY .............................................................................................................................. 1 S.1 Antonito Southeast SEZ .......................................................................................... 1 S.2 De Tilla Gulch SEZ ................................................................................................ 2 S.3 Fourmile SEZ .......................................................................................................... 3 S.4 Los Mogotes East SEZ............................................................................................ 3 1 INTRODUCTION ........................................................................................................... 5 1.1 Purpose of Report ................................................................................................... 5 1.2 Legal Description of the Subject Lands .................................................................. 5 1.3 Methodology and Resources ................................................................................... 7 1.4 Locatable Minerals.................................................................................................
    [Show full text]