Earth Sculpture; Or, The Origin of Land-forms |
From inside the book
Page ix
... Lava— “ Crystal Cellars " —Rock - shelters -Sea - caves . 250 266 CHAPTER XIV BASINS . Basins due to Crustal Deformation - Crater - lakes - Dissolution Basins - Lakes formed by Rivers - Æolian Basins - Drainage dis- turbed by Landslips ...
... Lava— “ Crystal Cellars " —Rock - shelters -Sea - caves . 250 266 CHAPTER XIV BASINS . Basins due to Crustal Deformation - Crater - lakes - Dissolution Basins - Lakes formed by Rivers - Æolian Basins - Drainage dis- turbed by Landslips ...
Page 20
... lava - form rocks are often associated with beds of volcanic débris ( tuff , etc. ) . Some igneous rocks are smoothly compact in texture , such as obsidian and pitchstone , which are simply varieties of volcanic glass ; others , such as ...
... lava - form rocks are often associated with beds of volcanic débris ( tuff , etc. ) . Some igneous rocks are smoothly compact in texture , such as obsidian and pitchstone , which are simply varieties of volcanic glass ; others , such as ...
Page 174
... lava comes from an acid magma , a basic lava from a basic magma . Hence it is inferred that many plu- tonic rocks now exposed by denudation may have been the deep - seated sources from which ancient lavas have proceeded . On the other ...
... lava comes from an acid magma , a basic lava from a basic magma . Hence it is inferred that many plu- tonic rocks now exposed by denudation may have been the deep - seated sources from which ancient lavas have proceeded . On the other ...
Page 180
... lava - flows and sheets of loose ejecta . At the summit is the central cup , or crater , marking the site of the vertical funnel , or throat , through which the various volcanic products find passage to the surface . These are naturally ...
... lava - flows and sheets of loose ejecta . At the summit is the central cup , or crater , marking the site of the vertical funnel , or throat , through which the various volcanic products find passage to the surface . These are naturally ...
Page 181
... lava may be associated . Not infre- quently , again , such cones have given vent to one or more lava - flows . From small cinder - cones , show- ing a single coulée , to great volcanoes built up of a multitudinous succession of lavas ...
... lava may be associated . Not infre- quently , again , such cones have given vent to one or more lava - flows . From small cinder - cones , show- ing a single coulée , to great volcanoes built up of a multitudinous succession of lavas ...
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Common terms and phrases
accumulation Alps anticlines basalt base-level basins become beds Carboniferous character cliffs coast-lines cones configuration Cretaceous crust crustal movements crystalline débris denudation deposits depressions depth detritus direction dislocations drainage elevation epigene action epigene agents eroded escarpments eventually feet fiords flexures flow fluvio-glacial deposits folds fracture gently geological structure glacial action glaciers gradually granite ground-moraines Highlands hills hollows horizontal strata ice-sheet igneous rocks inclined indented infrequently irregular islands joints Jura Mountains laccoliths lakes land land-forms land-surface lava less limestone low grounds masses materials Mesozoic modified moraines mountain-chain mountain-valleys mountains normal faults North Old Red Sandstone outcrops owe their origin Permian plain of erosion plateau regions relatively result ridges rock-basins rock-masses sand sandstones schistose schists Section sediment shales Silurian slopes Southern Uplands strata streams and rivers superficial surface surface-features synclinal tectonic tend thickness tion tracts traversed underground undulating usually valleys vertical volcanic