Transactions of the Cambridge Philosophical SocietyUniversity Press, 1822 |
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الصفحة 92
... coast of Somerset and North Devon , where we have the finest natural sections of these schistose masses , the strata do not preserve the same direction for many feet together ; but are continually deflected , and coiled on each other ...
... coast of Somerset and North Devon , where we have the finest natural sections of these schistose masses , the strata do not preserve the same direction for many feet together ; but are continually deflected , and coiled on each other ...
الصفحة 97
... coast of Cornwall ; for there are com- paratively few places where the cliffs exhibit such a shelving descent to the water's edge as to become the support of vegetation . Before I enter on the mineral character of the rocks above ...
... coast of Cornwall ; for there are com- paratively few places where the cliffs exhibit such a shelving descent to the water's edge as to become the support of vegetation . Before I enter on the mineral character of the rocks above ...
الصفحة 101
... coast , he must inevitably have found that such a conclusion was untenable . If the great parallel fissures be assumed as marking the separation between strata , and as indicating their order of superposition ; we shall , in almost ...
... coast , he must inevitably have found that such a conclusion was untenable . If the great parallel fissures be assumed as marking the separation between strata , and as indicating their order of superposition ; we shall , in almost ...
الصفحة 110
... coast , would far exceed the limits of this communication . I leave such detail with less reluctance , as several parts of the coast I am now considering will be described in the next volume of the Cornish Geological Transactions , by ...
... coast , would far exceed the limits of this communication . I leave such detail with less reluctance , as several parts of the coast I am now considering will be described in the next volume of the Cornish Geological Transactions , by ...
الصفحة 111
... coast where the granite and killas may be seen in contact . 1. At Trewavas Head , about two miles west of Porth Leven . 2. About half way between the last mentioned place , and the east side of Pra - Sands , where a patch of slate ...
... coast where the granite and killas may be seen in contact . 1. At Trewavas Head , about two miles west of Porth Leven . 2. About half way between the last mentioned place , and the east side of Pra - Sands , where a patch of slate ...
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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