Transactions of the Cambridge Philosophical SocietyUniversity Press, 1822 |
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الصفحة 17
... fissures , and metallic veins , to mark the boundaries where the upper strata have been swallowed up , or cease to appear ; or where the under strata push up towards the day . It would be easy to mark the variations in the thickness of ...
... fissures , and metallic veins , to mark the boundaries where the upper strata have been swallowed up , or cease to appear ; or where the under strata push up towards the day . It would be easy to mark the variations in the thickness of ...
الصفحة 101
... fissures , which often , for a considerable extent , preserve an exact parallelism among themselves . These masses are not unfrequently subdivided by a second system of fissures , nearly perpendicular to the former ; in consequence of ...
... fissures , which often , for a considerable extent , preserve an exact parallelism among themselves . These masses are not unfrequently subdivided by a second system of fissures , nearly perpendicular to the former ; in consequence of ...
الصفحة 102
... fissures , is considered as indicating the first stage of decomposition . By the action of the atmosphere , the fissures become enlarged ; the solid angles at the points of separation gradually disappear ; the rhomboidal blocks approach ...
... fissures , is considered as indicating the first stage of decomposition . By the action of the atmosphere , the fissures become enlarged ; the solid angles at the points of separation gradually disappear ; the rhomboidal blocks approach ...
الصفحة 109
... fissures , which divide the whole mount into parallel vertical beds . Between these beds are found oxide of tin , wolfram , apatite , the topaz , and some of the rarer minerals of the county . It would be difficult to prove that these ...
... fissures , which divide the whole mount into parallel vertical beds . Between these beds are found oxide of tin , wolfram , apatite , the topaz , and some of the rarer minerals of the county . It would be difficult to prove that these ...
الصفحة 130
... fissures , which are of such constant occurrence among the metalliferous veins , and which in such numberless instances have broken the line of con- tinuity of the great mineral beds , the Elvan courses appear to have borne exactly the ...
... fissures , which are of such constant occurrence among the metalliferous veins , and which in such numberless instances have broken the line of con- tinuity of the great mineral beds , the Elvan courses appear to have borne exactly the ...
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ABCD acid angle Apophyllite appearance axis ball beds carbonate of lime centre character chlorite schist clay slate cliffs coast colour compact composed considerable Cornwall Cove crystalline crystals cube cylinder decomposing decomposition described deviation direction distance district dyke earthy East equation examination exhibited Fellow felspar fissures formation fracture fragments function Galvanic gazometer granite granite veins granular green green-stone greywacké Helford river horizontal hornblende hydrogen inches instance intermixed irregular killas laminæ limestone Llanbabo Llaneilian Llanerchymedd Llanfaelog Llangefni Llanrhyddlad magnetic mass mica mineral muriate Nare point nature nearly needle North observed occur old red sandstone parallel particles passing perpendicular phenomena piston plane plate polarization porphyritic portion present pyroxene quartz quartz rock resembling Rhoscolyn schistose schorl serpentine side slaty South specimens steatite strata structure substance surface texture trace Trin ureters variety vertical whole wire