The Student's Handbook of Physical GeologyG. Bell, 1892 - 666 pages |
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Page 89
... sandstones are often reduced to the condition of a loose brown sand , or friable sandstone . Sands that were originally full of calcareous shells are frequently con- verted into a ferruginous sand , entirely devoid of organic remains ...
... sandstones are often reduced to the condition of a loose brown sand , or friable sandstone . Sands that were originally full of calcareous shells are frequently con- verted into a ferruginous sand , entirely devoid of organic remains ...
Page 90
... sandstones are more or less coloured by iron , either in the form of the red ferric oxide , or of the compound green silicate known as glauconite , and where such sands form a tract - heath , moor , or high forest - covered ground ...
... sandstones are more or less coloured by iron , either in the form of the red ferric oxide , or of the compound green silicate known as glauconite , and where such sands form a tract - heath , moor , or high forest - covered ground ...
Page 94
... sandstones which once covered them . : Mechanical Effects of Rain . - Everyone is aware that rain exercises a mechanical action in washing off the finer particles of soil , or of chemically disintegrated rock that all rain falling upon ...
... sandstones which once covered them . : Mechanical Effects of Rain . - Everyone is aware that rain exercises a mechanical action in washing off the finer particles of soil , or of chemically disintegrated rock that all rain falling upon ...
Page 98
... sandstone , rest- ing on a bed of stiff clay . The sandstone is easily dis- integrated by the action of rain and frost , and its surface weathers into a loose sandy soil , the particles of which are readily carried away by the ...
... sandstone , rest- ing on a bed of stiff clay . The sandstone is easily dis- integrated by the action of rain and frost , and its surface weathers into a loose sandy soil , the particles of which are readily carried away by the ...
Page 99
... sandstone , if long exposed to sand - drift , will be worn away at the base or undercut , until it presents the appearance of a gigantic mushroom . Some of the celebrated " Brimham rocks , " in Yorkshire , exhibit this form very ...
... sandstone , if long exposed to sand - drift , will be worn away at the base or undercut , until it presents the appearance of a gigantic mushroom . Some of the celebrated " Brimham rocks , " in Yorkshire , exhibit this form very ...
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Common terms and phrases
acid action agencies altered alumina amount anticlinal augite basalt beds blocks bottom calcareous calcite called carbonate of lime carbonic acid chalk channel chemical clay cleavage cliffs coast colour consists coral cracks crystalline crystals currents débris denudation deposits depth described detrition distance district dolerite dykes earth earth's crust Edited elevation erosion eruptions fault feet felspar fissures formation formed fragments Geol Geology glacier glauconite gneiss gradually granite greensand ground hills horizontal hornblende igneous rocks iron island Jukes lakes land lava layers limestone magnesia mass material metamorphic mica miles mineral mountain occur original Orthoclase outcrop oxide particles pebbles planes porphyritic portion pressure produced quartz rain reefs ridge rise river sand sandstone schist shale shells shore side siliceous slope soil solution sometimes stones strata stratified rocks stream structure surface thickness tion tract Translated unconformity valley vertical volcanic