Transactions of the Cambridge Philosophical SocietyUniversity Press, 1822 |
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الصفحة 93
... surface silky and of various cloudy colours ; in some instances micaceous , & c . The characters above - mentioned would by some be considered at once sufficient to determine the place of these rocks in the transition class . The ...
... surface silky and of various cloudy colours ; in some instances micaceous , & c . The characters above - mentioned would by some be considered at once sufficient to determine the place of these rocks in the transition class . The ...
الصفحة 94
... surface may be considered as making a rude approach to a broken table land of elliptical form , the longest diameter of which is more than 20 miles , and may be represented by a line drawn from Harford to Oakhampton . From many of the ...
... surface may be considered as making a rude approach to a broken table land of elliptical form , the longest diameter of which is more than 20 miles , and may be represented by a line drawn from Harford to Oakhampton . From many of the ...
الصفحة 95
... surface of the hills farther west , plainly point out the re - appearance of the granite , which occupies nearly all the remaining extremity of the county . With the exception of the tracts already enumerated , almost Professor SEDGWICK ...
... surface of the hills farther west , plainly point out the re - appearance of the granite , which occupies nearly all the remaining extremity of the county . With the exception of the tracts already enumerated , almost Professor SEDGWICK ...
الصفحة 97
... surface is occupied by granite bowlders , the remains of larger masses of the same kind which have gradually disappeared through the corrosive action of the elements . After descending from the granite ridge to the Killas , we often ...
... surface is occupied by granite bowlders , the remains of larger masses of the same kind which have gradually disappeared through the corrosive action of the elements . After descending from the granite ridge to the Killas , we often ...
الصفحة 100
... surface , and where the masses are , for obvious reasons , less ruinous than the blocks which lie scattered about the country . Some beautiful varieties are found between Trewavas - point and Pra- sands . From the eastern extremity of ...
... surface , and where the masses are , for obvious reasons , less ruinous than the blocks which lie scattered about the country . Some beautiful varieties are found between Trewavas - point and Pra- sands . From the eastern extremity of ...
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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