Ü Structural Landforms
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Interpretation of Cumberland Escarpment and Highland Rim, South-Central Tennessee and Northeast Alabama
Interpretation of Cumberland Escarpment and Highland Rim, South-Central Tennessee and Northeast Alabama GEOLOGICAL SURVEY PROFESSIONAL PAPER 524-C Interpretation of Cumberland Escarpment and Highland Rim, South-Central Tennessee and Northeast Alabama By JOHN T. HACK SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY GEOLOGICAL SURVEY PROFESSIONAL PAPER 524-C Theories of landscape origin are compared using as an example an area of gently dipping rocks that differ in their resistance to erosion UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1966 UNITED STATES DEPARTMENT OF THE INTERIOR STEWART L. UDALL, Secretary GEOLOGICAL SURVEY William T. Pecora, Director For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, D.C. 20402 CONTENTS Page Page Abstract___________________________________________ C1 Cumberland Plateau and Highland Rim as a system in Introduction_______________________________________ 1 equilibrium______________________________________ C7 General description of area___________________________ 1 Valleys and coves of the Cumberland Escarpment___ 7 Cumberland Plateau and Highland Rim as dissected and Surficial deposits of the Highland Rim____________ 10 deformed peneplains _____________________ ,... _ _ _ _ _ _ _ _ 4 Elk River profile_______________________________ 12 Objections to the peneplain theory____________________ 5 Paint Rock Creek profile________________________ 14 Eastern Highland Rim Plateau as a modern peneplain__ 6 Conclusions________________________________________ 14 Equilibrium concept -
TO BE DONE in BOOK} A
CLASS6 DATE: 16.05.2020 CHAPTER 2. LANDFORMS EXERCISE WITH QUESTION ANSWERS AND MAP WORK. 1. TICK THE RIGHT OPTION {TO BE DONE IN BOOK} a. Aravallis. b. Intermontane plateau. c. Faulting. d. Deposition. 2. FILL IN THE BLANKS {TO BE DONE IN BOOK} a. Pointed. b. Minerals. c. Fault zone. d. Old fold. 3. Differentiate between: {TO BE DONE IN NOTEBOOK} a. Old Fold Mountain Young Fold Mountain These mountains have been subjected to the They are newly formed and having forces of denudation for a long geological heights higher than old fold mountain. period. They are much lower with rounded peaks They have pointed peaks, steeper and and gentle slopes. deeper slopes. Eg: Aravalli in India. Eg: The Himalayas in India. b. Rift Valley Block mountain The lowland mass remaining after the The uplifted land mass remaining after faulting are known as Rift valley. the faulting are known as Block mountains It is bordered by fault zones and separated Block mountains are steep sided and flat by land masses. topped. Eg: Great Rift Valley of Africa. Eg: Vindhyas in India. c. Erosional Plains Depositional Plains This type of plains are formed as result of It is formed as a result of deposition of erosion and weathering. sediments. These plains have been flattened by the These plains are made by depositing the erosion of soil and rocks away from a soil and rocks on a lower surface. higher feature. Eg:- Upper Mississippi valley of USA. Eg:- The Indo-Gangetic Plains in India. d. Intermontane Plateaus Piedmont Plateaus They are the highest and the most extensive They are relatively low rolling hills with type. -
Sketch of Yosemite National Park and an Account of the Origin of the Yosemite and Hetch Hetchy Valleys
SKETCH OF YOSEMITE NATIONAL PARK AND AN ACCOUNT OF THE ORIGIN OF THE YOSEMITE AND HETCH HETCHY VALLEYS DEPARTMENT OF THE INTERIOR OFFICE OF THE SECRETARY 1912 This publication may be purchased from the Superintendent of Documents, Government Printing Office, Washington. I). C, for LO cents. 2 SKETCH OP YOSEMITE NATIONAL PARK AND ACCOUNT OF THE ORIGIN OF THE YOSEMITE AND HETCH HETCHY VALLEYS. By F. E. MATTHES, U. S. Geological Surrey. INTRODUCTION. Many people believe that the Yosemite National Park consists principally of the Yosemite Valley and its bordering heights. The name of the park, indeed, would seem to justify that belief, yet noth ing could be further from the truth. The Yosemite Valley, though by far the grandest feature of the region, occupies only a small part of the tract. The famous valley measures but a scant 7 miles in length; the park, on the other hand, comprises no less than 1,124 square miles, an area slightly larger than the State of Rhode Island, or about one-fourth as large as Connecticut. Within this area lie scores of lofty peaks and noble mountains, as well as many beautiful valleys and profound canyons; among others, the Iletch Hetchy Valley and the Tuolumne Canyon, each scarcely less wonderful than the Yosemite Valley itself. Here also are foaming rivers and cool, swift trout brooks; countless emerald lakes that reflect the granite peaks about them; and vast stretches of stately forest, in which many of the famous giant trees of California still survive. The Yosemite National Park lies near the crest of the great alpine range of California, the Sierra Nevada. -
Chapter 40. Appalachian Planation Surfaces
Chapter 40 Appalachian Planation Surfaces The Appalachian region not only includes the mountains, but also the surrounding provinces. During the erosion episode (see Chapter 8 and Appendix 4), rocks of the Appalachians were sometimes planed into a flat or nearly flat planation surface, especially on the provinces east and west of the Blue Ridge Mountains (Figure 40.1). But planation surfaces are also found in the Appalachian Mountains, mainly on the mountaintops. Figure 40.1. Map of the Appalachian provinces and the two provinces to the west (from Aadland et al., 1992). Due to their rolling and dissected morphology, the Appalachian provinces are rarely called planation surfaces, but they would mostly be erosion surfaces. I will continue to use the more descriptive term, planation surface, with the understanding that many of these are erosion surfaces. The Appalachian provinces exhibit three possible planation surfaces, from east to west, they include: (1) the Piedmont Province, (2) the accordant mountaintops of the Valley and Ridge Province (part of the Appalachian Mountains), and (3) the Appalachian Plateau which is divided into the Allegheny Plateau in the north and the Cumberland Plateau in the south. I also will include the Interior Low Plateaus Province to the west of the Appalachian Plateau. Many articles have been published about the Appalachian planation surface. Their origin is controversial among secular geologists, but they can readily be explained by the runoff of the global Genesis Flood. Figure 40.2. Lake on the Piedmont near Parkersville, South Carolina, showing general flatness of the terrain. The Piedmont Planation Surface The Piedmont Province begins just east of the Blue Ridge Mountains from the Hudson River in the north to Alabama in the south. -
Firth of Lorn Management Plan
FIRTH OF LORN MARINE SAC OF LORN MARINE SAC FIRTH ARGYLL MARINE SPECIAL AREAS OF CONSERVATION FIRTH OF LORN MANA MARINE SPECIAL AREA OF CONSERVATION GEMENT PLAN MANAGEMENT PLAN CONTENTS Executive Summary 1. Introduction CONTENTS The Habitats Directive 1.1 Argyll Marine SAC Management Forum 1.2 Aims of the Management Plan 1.3 2. Site Overview Site Description 2.1 Reasons for Designation: Rocky Reef Habitat and Communities 2.2 3. Management Objectives Conservation Objectives 3.1 Sustainable Economic Development Objectives 3.2 4. Activities and Management Measures Management of Fishing Activities 4.1 Benthic Dredging 4.1.1 Benthic Trawling 4.1.2 Creel Fishing 4.1.3 Bottom Set Tangle Nets 4.1.4 Shellfish Diving 4.1.5 Management of Gathering and Harvesting 4.2 Shellfish and Bait Collection 4.2.1 Harvesting/Collection of Seaweed 4.2.2 Management of Aquaculture Activities 4.3 Finfish Farming 4.3.1 Shellfish Farming 4.3.2 FIRTH OF LORN Management of Recreation and Tourism Activities 4.4 Anchoring and Mooring 4.4.1 Scuba Diving 4.4.2 Charter Boat Operations 4.4.3 Management of Effluent Discharges/Dumping 4.5 Trade Effluent 4.5.1 CONTENTS Sewage Effluent 4.5.2 Marine Littering and Dumping 4.5.3 Management of Shipping and Boat Maintenance 4.6 Commercial Marine Traffic 4.6.1 Boat Hull Maintenance and Antifoulant Use 4.6.2 Management of Coastal Development/Land-Use 4.7 Coastal Development 4.7.1 Agriculture 4.7.2 Forestry 4.7.3 Management of Scientific Research 4.8 Scientific Research 4.8.1 5. -
Cover and Final Landform Design for the B-Zone Waste Rock Pile at Rabbit Lake Mine
Cover and final landform design for the B-zone waste rock pile at Rabbit Lake Mine Brian Ayres1, Pat Landine2, Les Adrian2, Dave Christensen1, Mike O’Kane1 1O’Kane Consultants Inc., Saskatoon, Saskatchewan, Canada 2Cameco Corporation, Saskatoon, Saskatchewan, Canada Abstract. A detailed study was undertaken to evaluate various cover system and final landform designs for the B-zone waste rock pile at Rabbit Lake Mine in Can- ada. Several tasks were completed including physical and hydraulic characteriza- tion of the waste and potential cover materials and numerical modelling to exam- ine erosion and slope stability. Soil-atmosphere numeric simulations were conducted to predict net infiltration and oxygen ingress rates through several cover system alternatives. A seepage numerical modelling programme was com- pleted to predict current and future seepage rates from the base of the pile for al- ternate cover system designs. Several final landform alternatives were developed for the pile along with a preliminary design for a surface water management sys- tem. The potential impact of various physical, chemical, and biological processes on the sustainable performance of the final landform was also considered. This paper provides an overview of the investigations completed towards the develop- ment of a cover system and final landform design for the B-zone waste rock pile. Introduction Rabbit Lake Mine, owned and operated by Cameco Corporation, began operation in 1975, and is the longest operating uranium production facility in Saskatchewan, Canada. The operation is located 700 km north of Saskatoon (Fig. 1). Historic and current operations at this site include four open pits, one underground mine, sev- eral mine waste storage facilities, and a mill. -
Bulletin of the Geological Society of America Vol. 71, Pp
BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA VOL. 71, PP. 363-398. 34 FIGS. APRIL 1960 DIASTROPHISM AND MOUNTAIN BUILDING BY MAELAND P. BILLINGS (Address as Retiring President of The Geological Society of America) ABSTRACT For many years the terms orogeny and mountain building have been used so loosely that they no longer convey definite meanings. Because of this lack of precision, hypothe- ses of diastrophism are often based on false premises. Folding and thrusting, often referred to as tectogenesis or orogeny, is best displayed by stratified rocks. Some geologists believe that folds and thrusts are due to vertical movements accompanied by lateral spreading, that the strata are stretched an amount commensurate with the intensity of the folding, and that the opposite sides of the sedi- mentary packet do not move toward each other. Most geologists, however, agree that during folding and thrusting the strata are shortened and that the two opposite sides of the sedimentary packet move toward each other by an amount commensurate with the intensity of the folding. But it is not clear to what extent the entire crust in the deformed belt is shortened. In one extreme view, the two opposite ends of the deformed belt do not move toward each other, and the folds and thrusts result from gravity sliding. At the other extreme, the entire crust is believed to be shortened to the same extent as the sedi- mentary strata. An excellent example of broad vertical movements (epeirogenesis) that has never been sufficiently emphasized is in eastern North America, involving the Appalachians, Coastal Plain, and Continental Shelf. -
Why Did the Southern Gulf of California Rupture So Rapidly?—Oblique Divergence Across Hot, Weak Lithosphere Along a Tectonically Active Margin
Why did the Southern Gulf of California rupture so rapidly?—Oblique divergence across hot, weak lithosphere along a tectonically active margin breakup, is mainly dependent on the thermal structure, crust- Paul J. Umhoefer, Geology Program, School of Earth Sciences & Environmental Sustainability, Northern Arizona University, al thickness, and crustal strength of the lithosphere when Flagstaff, Arizona 86011, USA; [email protected] rifting begins (e.g., Buck, 2007), as well as forces at the base of the lithosphere and far-field plate interactions (Ziegler and Cloetingh, 2004). ABSTRACT Continental rupture at its two extremes creates either large Rifts in the interior of continents that evolve to form large ocean basins or small and narrow marginal seas depending oceans typically last for 30 to 80 m.y. and longer before com- largely on the tectonic setting of the rift. Rupture of a conti- plete rupture of the continent and onset of sea-floor spreading. nent that creates large oceans most commonly initiates as A distinct style of rifts form along the active tectonic margins of rifts in old, cold continental lithosphere or within former continents, and these rifts more commonly form marginal seas large collisional belts in the interior of large continents, part and terranes or continental blocks or slivers that are ruptured of the process known as the Wilson Cycle (Wilson, 1966). away from their home continent. The Gulf of California and the Rupture to create narrow marginal seas commonly occurs in Baja California microplate make up one of the best examples active continental margins and results in the formation of of the latter setting and processes. -
The Case for a Marine Act for Scotland the Tangle of the Forth
The Case for a Marine Act for Scotland The Tangle of the Forth © WWF Scotland For more information contact: WWF Scotland Little Dunkeld Dunkeld Perthshire PH8 0AD t: 01350 728200 f: 01350 728201 The Case for a Marine Act for Scotland wwf.org.uk/scotland COTLAND’S incredibly Scotland’s territorial rich marine environment is waters cover 53 per cent of Designed by Ian Kirkwood Design S one of the most diverse in its total terrestrial and marine www.ik-design.co.uk Europe supporting an array of wildlife surface area Printed by Woods of Perth and habitats, many of international on recycled paper importance, some unique to Scottish Scotland’s marine and WWF-UK registered charity number 1081274 waters. Playing host to over twenty estuarine environment A company limited by guarantee species of whales and dolphins, contributes £4 billion to number 4016274 the world’s second largest fish - the Scotland’s £64 billion GDP Panda symbol © 1986 WWF – basking shark, the largest gannet World Wide Fund for Nature colony in the world and internationally 5.5 million passengers and (formerly World Wildlife Fund) ® WWF registered trademark important numbers of seabirds and seals 90 million tonnes of freight Scotland’s seas also contain amazing pass through Scottish ports deepwater coral reefs, anemones and starfish. The rugged coastline is 70 per cent of Scotland’s characterised by uniquely varied habitats population of 5 million live including steep shelving sea cliffs, sandy within 0km of the coast and beaches and majestic sea lochs. All of 20 per cent within km these combined represent one of Scotland’s greatest 25 per cent of Scottish Scotland has over economic and aesthetic business, accounting for 11,000km of coastline, assets. -
Changing Hillslopes : Evolution and Inheritance
Provided for non-commercial research and educational use only. Not for reproduction, distribution or commercial use. This chapter was originally published in the Treatise on Geomorphology, the copy attached is provided by Elsevier for the author’s benefit and for the benefit of the author’s institution, for non-commercial research and educational use. This includes without limitation use in instruction at your institution, distribution to specific colleagues, and providing a copy to your institution’s administrator. All other uses, reproduction and distribution, including without limitation commercial reprints, selling or licensing copies or access, or posting on open internet sites, your personal or institution’s website or repository, are prohibited. For exceptions, permission may be sought for such use through Elsevier’s permissions site at: http://www.elsevier.com/locate/permissionusematerial Roering J.J., and Hales T.C. Changing Hillslopes: Evolution and Inheritance; Inheritance and Evolution of Slopes. In: John F. Shroder (Editor-in-chief), Marston, R.A., and Stoffel, M. (Volume Editors). Treatise on Geomorphology, Vol 7, Mountain and Hillslope Geomorphology, San Diego: Academic Press; 2013. p. 284-305. © 2013 Elsevier Inc. All rights reserved. Author's personal copy 7.29 Changing Hillslopes: Evolution and Inheritance; Inheritance and Evolution of Slopes JJ Roering, University of Oregon, Eugene, OR, USA TC Hales, Cardiff University, Cardiff, UK r 2013 Elsevier Inc. All rights reserved. 7.29.1 Introduction 285 7.29.2 Hillslope Evolution -
ACTIVITY 7 – MARKING GUIDELINE: 1. a – Cuesta B – Homoclinal Ridge C
ACTIVITY 7 – MARKING GUIDELINE: 1. A – Cuesta B – Homoclinal ridge C – Hogsback 2. Sedimentary 3. Inclined rocks with different resistance to erosion. Soft rock erodes away more quickly than hard rock. 4. The dip slope is 10–25° to the horizontal. Folding can result in cuesta basins and cuesta domes. 5. Farming can take place on dip slopes. Roads and railways can be built parallel to these landscapes. Gaps or poorts between homoclinal ridges can be good sites to build dams. Cuesta basins yield artesian water. Cuesta domes may contain oil and natural gas (fracking). Fertile valleys and plains between cuestas are suitable for human settlements. These ridges are used for forestry, tourism, recreation and nature conservation. These ridges can be used for defence purposes. (Accept any relevant answer) ACTIVITY 8 – MARKING GUIDELINE: 1. It occurs when strata are subjected to stress (compression, tension, volcanic intrusion, or tectonic movement) and they become tilted relative to their original (horizontal) position. Faulting or folding causes the strata to be tilted. The beds may be inclined in any direction with the angle of the dip slope between 0º to 90º. 2. Cuesta dome 3. The scarp slope faces inward, and dip slopes faces outward. 4. HOMOCLINICAL RIDGE: HOGSBACK: 5. HOMOCLINICAL RIDGE: HOGSBACK: • The angle of the dip slope lies 25º – 45º; • The angle of the dip slope is more than 45º; • Rivers cut poorts through the ridges; • There is very little difference in the gradient of the scarp and dip slopes ACTIVITY 9 – MARKING GUIDELINE: 1. A ridge that develop in tilted sedimentary rock characterised by a gentle slope and a steep slope 2. -
Geology and Geomorphology of the Urema Graben with Emphasis on the Evolution of Lake Urema
Journal of African Earth Sciences 58 (2010) 272–284 Contents lists available at ScienceDirect Journal of African Earth Sciences journal homepage: www.elsevier.com/locate/jafrearsci Geology and geomorphology of the Urema Graben with emphasis on the evolution of Lake Urema Franziska Steinbruch * Scientific Services of Gorongosa National Park, Avenida do Poder Popular 264, Beira, Mozambique article info abstract Article history: The Lake Urema floodplain belongs to the Urema Catchment and is located in the downstream area of the Received 19 December 2008 Pungwe River basin in Central Mozambique. The floodplain is situated in the Urema Graben, which is the Received in revised form 8 February 2010 southern part of the East African Rift System. Little geological information exists about this area. The cir- Accepted 12 March 2010 culated information is not readily available, and is often controversial and incomplete. In this paper the Available online 20 March 2010 state of knowledge about the geology and tectonic evolution of the Lake Urema wetland area and the Urema Catchment is compiled, reviewed and updated. This review is intended to be a starting point Keywords: for approaching practical questions such as: How deep is the Urema Graben? What controls the hydrol- East African Rift System ogy of Lake Urema? Where are the hydrogeological boundaries? Where are the recharge areas of the Lake Floodplain Hydrogeology Urema floodplain? From there information gaps and needs for further research are identified. Lake Urema Ó 2010 Elsevier Ltd. All rights reserved. Mozambique 1. Introduction 2. Regional geology and tectonic evolution The Lake Urema floodplain belongs to the Urema Catchment 2.1.