Competition Between Stream Erosion, Cave Development, Surface Denudation, and Tectonic Uplift
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"Erosion,' Surfaces Of" ' '" '"
· . ,'.' . .' . ' :' ~ . DE L'INSTITUTNATIONAL ' /PQi[JRJl.'El'UDJiAC;RO,NU1VII,QlUE, DU CONGO BELGE , , (I. N. E.A: C.) "EROSION,' SURFACES OF" ' '" '""",,,U ,,"GENTRALAFRICANINTERIOR' ,HIGH PLATEAUS" 'T.OCICAL SURVEYS ,BY Robert V. RUHE Geomorphologist ECA ' INEAC Soil Mission Belgian Congo. , SERIE SCIENTIFIQUE N° 59 1954 BRITISH GEOLOGICAL SURVEY 11111' IIII II IIIJ '11 III If II I 78 0207537 9 EROSION SURF ACES OF CENTRAL AFRICAN INTERIOR HIGH PLATEAUS I PUBLICATIONS DE L'INSTITUT NATIONAL POUR L'ETUDE AGRONOMIQUE DU CONGO BELGE I I (1. N. E.A. C.) ! I EROSION SURFACES OF CENTRAL AFRICAN INTERIOR HIGH PLATEAUS BY Robert V. RUHE Gcomorphologist ECA ' INEAC Soil Mission Belgian Congo. Ij SERIE SCIENTIFIQUE N° 59 1954 CONTENTS Abstract 7 'Introduction 9 Previous work. 12 Geographic Distribution of Major Erosion Surfaces 12 Ages of the Major Erosion Surfaces 16 Tertiary Erosion Surfaces of the Ituri, Belgian Congo 18 Post-Tertiary Erosion Surfaces of the Ituri, Belgian Congo 26 Relations of the Erosion Surfaces of the Ituri Plateaus and the Congo Basin 33 Bibliography 37 ILLUSTRATIONS FIG. 1. Region of reconnaissance studies. 10 FIG. 2. Areas of detailed and semi-detailed studies. 11 FIG. 3. Classification of erosion surfaces by LEPERsONNE and DE HEINZELlN. 14 FIG. 4. Area-altitude distribution curves of erosion surfaces of Loluda Watershed. 27 FIG. 5. Interfluve summit profiles and adjacent longitudinal stream profiles in Loluda Watershed . 29 FIG. 6. Composite longitudinal stream profile in Loluda Watershed. 30 FIG. 7. Diagrammatic explanation of cutting of Quaternary surfaces- complex (Bunia-Irumu Plain) . 34 PLATES I Profiles of end-Tertiary erosion surface. -
Part 629 – Glossary of Landform and Geologic Terms
Title 430 – National Soil Survey Handbook Part 629 – Glossary of Landform and Geologic Terms Subpart A – General Information 629.0 Definition and Purpose This glossary provides the NCSS soil survey program, soil scientists, and natural resource specialists with landform, geologic, and related terms and their definitions to— (1) Improve soil landscape description with a standard, single source landform and geologic glossary. (2) Enhance geomorphic content and clarity of soil map unit descriptions by use of accurate, defined terms. (3) Establish consistent geomorphic term usage in soil science and the National Cooperative Soil Survey (NCSS). (4) Provide standard geomorphic definitions for databases and soil survey technical publications. (5) Train soil scientists and related professionals in soils as landscape and geomorphic entities. 629.1 Responsibilities This glossary serves as the official NCSS reference for landform, geologic, and related terms. The staff of the National Soil Survey Center, located in Lincoln, NE, is responsible for maintaining and updating this glossary. Soil Science Division staff and NCSS participants are encouraged to propose additions and changes to the glossary for use in pedon descriptions, soil map unit descriptions, and soil survey publications. The Glossary of Geology (GG, 2005) serves as a major source for many glossary terms. The American Geologic Institute (AGI) granted the USDA Natural Resources Conservation Service (formerly the Soil Conservation Service) permission (in letters dated September 11, 1985, and September 22, 1993) to use existing definitions. Sources of, and modifications to, original definitions are explained immediately below. 629.2 Definitions A. Reference Codes Sources from which definitions were taken, whole or in part, are identified by a code (e.g., GG) following each definition. -
Erosional Cycles in the Front Range of Colorado and Their Correlation 1
BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA W VOL. 36. PP. 498-512 SEPTEMBER 30. 1925 EROSIONAL CYCLES IN THE FRONT RANGE OF COLORADO AND THEIR CORRELATION 1 BY HOJIKR P. LITTLE (P resented in abstract before the Society December 29, J02J,1) CONTENTS Puice Introduction................................................. ......................................................................... 495 Peneplains of the Front Range................................................................................. 497 General statement...................................................................................................... 497 The Flattop peneplain............................................................................................... 498 The Rocky Mountain peneplain............................................................................. 500 The Park stage............................................................................................................. 504 The Fountain Creek stage....................................................................................... 507 The Canyon-cutting stage........................................................................................ 509 Age and correlation of erosion cycles..................................................... ............... 509 Discussion......................................................: ....................................................................... 510 Bibliography......................................................................................................................... -
Origin of the High Elevated Pyrenean Peneplain Julien Babault, Jean Van Den Driessche, Stéphane Bonnet, Sébastien Castelltort, Alain Crave
Origin of the high elevated Pyrenean peneplain Julien Babault, Jean van den Driessche, Stéphane Bonnet, Sébastien Castelltort, Alain Crave To cite this version: Julien Babault, Jean van den Driessche, Stéphane Bonnet, Sébastien Castelltort, Alain Crave. Origin of the high elevated Pyrenean peneplain. Tectonics, American Geophysical Union (AGU), 2005, 24 (2), art. no. TC2010, 19 p. 10.1029/2004TC001697. hal-00077900 HAL Id: hal-00077900 https://hal.archives-ouvertes.fr/hal-00077900 Submitted on 29 Jun 2016 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. TECTONICS, VOL. 24, TC2010, doi:10.1029/2004TC001697, 2005 Origin of the highly elevated Pyrenean peneplain Julien Babault, Jean Van Den Driessche, and Ste´phane Bonnet Ge´osciences Rennes, UMR CNRS 6118, Universite´ de Rennes 1, Rennes, France Se´bastien Castelltort Department of Earth Sciences, Eidgenossische Technische Hochschule-Zentrum, Zurich, Switzerland Alain Crave Ge´osciences Rennes, UMR CNRS 6118, Universite´ de Rennes 1, Rennes, France Received 9 June 2004; revised 5 December 2004; accepted 13 December 2004; published 19 April 2005. [1] Peneplanation of mountain ranges is generally base level in the penultimate stage of a humid, fluvial considered the result of long-term erosional processes geomorphic cycle.’’ They specify that ‘‘peneplain’’ also that smooth relief and lower elevation near sea level. -
Etchplain, Rock Pediments, Glacises and Morphostructural Analysis of the Bohemian Massif (Czech Republic) Jaromir Demek [email protected] Rudka Č
GeoMorfostrukturnímorfologický a sborník tektonické 2 problémy ČAG, ZČU v Plzni, 2003 Etchplain, rock pediments, glacises and morphostructural analysis of the Bohemian Massif (Czech Republic) Jaromir Demek [email protected] Rudka č. 66, Kunštát na Moravě CZ 679 72 The Bohemian Massif forms the western part of Czech Republic. The massif belongs to the Western European Platform, which basement was consolidated by Variscan folding. The Bohemian Massif is characterized by a typical platform regime during Mesozoic and Paleogene Periods, i.e. by low intensity of tectonic movements and slight relief differentiation. This regime was reflected in a structural compatibility and morphological uniformity of the Massif, with altitudes of its planated surface (mostly peneplain with thick regolith mantle) ranging from 0 to 200 m a.s.l. The present-day relief of the Bohemian Massif developed for the most part in the Neotectonic period (Upper Oligocene to Quaternary). The older idea that o the Bohemian Massif responded to stresses caused by neotectonic movements generally as a rigid unit (with some differences in individual regions) and o that in the Bohemian Massif preserved in very large extent old peneplain (KUNSKÝ, 1968, p. 27), seams to be abandoned now. Already in 1930 Ms. Julie Moschelesová proposed the hypothesis of neotectonic megaanticlinals and megasynclinals in the basement of the Bohemian Massif. At present the Bohemian Massif is understood as a complex mountain, which relief is composed of megaanticlinals and megasynclinals, horstes and grabens and volcanic mountains? Individual parts of the Bohemian Massif moved in different directions and with different intensity during Neotectonic Period. The determination of directions, intensity and type of Neotectonic deformations of the Earth’s crust is difficult due to lack of correlated deposits. -
2 Observation in Geomorphology
2 Observation in Geomorphology Bruce L. Rhoads and Colin E. Thorn Department of Geography, University of Illinois at Urbana-Champaign ABSTRACT Observation traditionally has occupied a central position in geomorphologic research. The prevailing, tacit attitude of geomorphologists toward observation appears to be consistent with radical empiricism. This attitude stems from a strong historical emphasis on the value of fieldwork in geomorphology, which has cultivated an aesthetic for letting the data speak for themselves, and from cursory and exclusive exposure of many geomorphologists to empiricist philosophical doctrines, especially logical positivism. It is, by and large, also an unexamined point of view. This chapter provides a review of contemporary philosophical perspectives on scientific observation. This discussion is then used as a filter or lens through which to view the epistemic character and role of observation in geomorphology. Analysis reveals that whereas G.K. Gilbert's theory-laden approach to observation preserved scientific objectivity, the extreme theory-ladenness of W.M. Davis's observational procedures often resulted in considerable subjectivity. Contemporary approaches to observation in geomorphology are shown to conform broadly with the model provided by Gilbert. The hallmark of objectivity in geomorphology is the assurance of data reliability through the introduction of fixed rule-based procedures for obtaining information. INTRODUCTION Geomorphologists traditionally have assigned great virtue to observation. The venerated status of observation can be traced to the origin of geomorphology as a field science in the late 1800s. Exploration of sparsely vegetated landscapes in the American West by New- berry, Powell, Hayden, Gilbert, and others inspired perceptive insights about landscape dynamics that provided a foundation for the discipline (Baker and Twidale 1991). -