Outlines of Field-geologyMacmillan and Company, 1882 - 222 pages |
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Common terms and phrases
abundant acid angle of dip anticlinal augite balsam bands basalt beds calcite cavities CHAPTER character chip clay clinometer colour constituents course crystalline rocks crystals curved deposits diorite direction district dyke earth's crust evidence examination example exposed fault felspar field field-geologist field-work foliated foliated rocks formations fossils fracture fragments geological map geological structure Geological Survey geologist glass gneiss granite gravel ground hammer horizontal hornblende igneous rocks inches interbedded intrusive iron kind lava limestone marked mass microscope miles minerals mountain nature Nicol prisms observer obtained occur Old Red Sandstone organic remains outcrop piece prisms quartz recognise Red Sandstone region sand scale schists sedimentary seen shales sheet side silicates slice soil solid rock sometimes specimens stone strata stratified rocks stratum streams striæ strike superficial surface synclinal texture thickness thin tion traced traverse tuff unconformability valleys varieties veins vertical volcanic weathered