Transactions of the Cambridge Philosophical SocietyUniversity Press, 1822 |
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الصفحة 372
... Llangefni to Trefdraeth . The ground is completely broken up by rugged pro- jecting rocks . Some of these are slaty , but in general they present a hard jaspideous aspect with contorted stripes , which mark the existence of former ...
... Llangefni to Trefdraeth . The ground is completely broken up by rugged pro- jecting rocks . Some of these are slaty , but in general they present a hard jaspideous aspect with contorted stripes , which mark the existence of former ...
الصفحة 384
... Llangefni to the South of Bodorgon , possesses a different character from the rest ( 238-250 . ) . That a portion of it consists of greywacké , is evident ; but whether it belongs to the present series or to the last , or whether it be ...
... Llangefni to the South of Bodorgon , possesses a different character from the rest ( 238-250 . ) . That a portion of it consists of greywacké , is evident ; but whether it belongs to the present series or to the last , or whether it be ...
الصفحة 396
... Llangefni . From Llangefni to Bodorgan the junction takes place along the side and near the top of an elevated ridge of schist . On the Eastern side of the river , there is another ridge of schist which extends from Caint to Llanddwyn ...
... Llangefni . From Llangefni to Bodorgan the junction takes place along the side and near the top of an elevated ridge of schist . On the Eastern side of the river , there is another ridge of schist which extends from Caint to Llanddwyn ...
الصفحة 441
... Llangefni , and from thence , towards the S. W. to Aberfraw . Hand specimens cannot convey a just idea of the appearances exhibited in a quarry of this hornstone . The irregular intermixture , which takes place in the different shades ...
... Llangefni , and from thence , towards the S. W. to Aberfraw . Hand specimens cannot convey a just idea of the appearances exhibited in a quarry of this hornstone . The irregular intermixture , which takes place in the different shades ...
الصفحة 442
... Llangefni , ( p . 384. ) . In an inter- mediate state , the schist has a fragmental aspect , the fragments drawn out into strings ( 243. ) . At Bodorgan , we find a mass of basalt and greenstone protruding in the midst of the small ...
... Llangefni , ( p . 384. ) . In an inter- mediate state , the schist has a fragmental aspect , the fragments drawn out into strings ( 243. ) . At Bodorgan , we find a mass of basalt and greenstone protruding in the midst of the small ...
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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