Structural Landforms: Landforms Associated with Granitic Rocks, Faults, and Folded StrataUp to the end of the nineteenth century, landforms were viewed largely as expressions of the structure of the earth's underlying crust. But such interpretations were concerned for the most part with generalities and broad effects; the subtleties of structural factors became overshadowed first by cyclic explanations and then by the modern emphasis on process and climatic geomorphology. This book arose from the neglect of structural factors in geomorphological interpretation. Nowadays it is recognized that details of jointing and faulting, both past and present, of the stresses in folds, of past conditions of sedimentation, all play an important part in the determination of present landforms. Moreover, today's geomorphologists must think in terms not only of distribution—length and breadth—but also in terms of vertical and temporal change. The author brings this new thinking into Structural Landformsand the result is a book of great interest and importance to students of geography and geology, to teachers and professional geomorphologists. It is particularly rich in photographs and line figures, and includes an excellent bibliography. |
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Page 183
... clay derived from the weathering of the gneiss , is at the base . The weathering of the gneiss is uneven , so that the weathering front displays highs and lows . The pressure exerted by the over- lying dense layers has caused clays to ...
... clay derived from the weathering of the gneiss , is at the base . The weathering of the gneiss is uneven , so that the weathering front displays highs and lows . The pressure exerted by the over- lying dense layers has caused clays to ...
Page 184
... Clay а Clay 2 Schist Quartz vein 3 20 METRES 10 b wwwww Valley bulge 60 -30 0 METRES C Presumed original base Welland Valley Camber structure Marlstone Rock Bed 60 Upper Lias clay 30 0 Ordnance Datum Lower & middle Lias clays & marls ...
... Clay а Clay 2 Schist Quartz vein 3 20 METRES 10 b wwwww Valley bulge 60 -30 0 METRES C Presumed original base Welland Valley Camber structure Marlstone Rock Bed 60 Upper Lias clay 30 0 Ordnance Datum Lower & middle Lias clays & marls ...
Page 185
... clays . Minor horsts have in this fashion been developed ( Fig . 82c ) . Such flowage of clays into the valleys causes deficiencies beneath the plateau margins . Moreover , water has percolated through the pervious limestones and ...
... clays . Minor horsts have in this fashion been developed ( Fig . 82c ) . Such flowage of clays into the valleys causes deficiencies beneath the plateau margins . Moreover , water has percolated through the pervious limestones and ...
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Common terms and phrases
adjacent Alpine Fault anticlines areas Basin bedding bedrock boulders Bull caused clays compression corestones country rock crust Dartmoor debris depressions developed dislocation display domed inselbergs drainage east eastern eroded evolved example exposed Eyre Peninsula fault scarps fault zone fault-line scarp Flinders Ranges fold forms fractures Geol geological geomorphology give rise gnammas gneiss gorge granite outcrops granitic rocks inselbergs instance joint blocks KILOMETRES Lake Torrens lamination land surface landforms major marginal mass massive METRES MILES JH morphology Mountains movements Mt Lofty Ranges Northern Territory northwestern Eyre Peninsula occur origin pattern plain planes plateau region relief residuals resistant ridges and valleys Rift System rift valleys rivers San Andreas sandstone sedimentary sediments sequences sheet structure South Australia southern Spheroidal weathering strata streams stress subsurface weathering suggested synclines tectonic Twidale types uplands uplift vertical weathered granite weathering and erosion weathering front Western Australia wrench faults Zagros