Transactions of the Cambridge Philosophical SocietyUniversity Press, 1822 |
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الصفحة 380
... Llanerchymedd , the greywacké character prevails , the base being a black clay slate , which encloses fragments of quartz and slate . More to the East and N.E. it generally consists of shattery fine grained black clay slate , which is ...
... Llanerchymedd , the greywacké character prevails , the base being a black clay slate , which encloses fragments of quartz and slate . More to the East and N.E. it generally consists of shattery fine grained black clay slate , which is ...
الصفحة 381
... series is universally inclined at a very high angle to the horizon . In the central district , on which Llanerchymedd is situate , G.1 . the bearing of the greatest portion is from the E. 3c2 Geology of Anglesea . 381.
... series is universally inclined at a very high angle to the horizon . In the central district , on which Llanerchymedd is situate , G.1 . the bearing of the greatest portion is from the E. 3c2 Geology of Anglesea . 381.
الصفحة 389
... Llanerchymedd a coarser variety is found with pebbles ( 366. ) , which on the beach S. W. of Dulas harbour , form a breccia of the rudest description 0.5 . ( 293. ) . The upper beds extend from Bodafon to the mountain- lime on its East ...
... Llanerchymedd a coarser variety is found with pebbles ( 366. ) , which on the beach S. W. of Dulas harbour , form a breccia of the rudest description 0.5 . ( 293. ) . The upper beds extend from Bodafon to the mountain- lime on its East ...
الصفحة 390
... Llanerchymedd , the strata dip to a point 30 ° to the W. of N. , and are inter- stratified with thin seams of black clay slate : which appears to indicate a gradual transition from the greywacké to the sand- stone . The termination of ...
... Llanerchymedd , the strata dip to a point 30 ° to the W. of N. , and are inter- stratified with thin seams of black clay slate : which appears to indicate a gradual transition from the greywacké to the sand- stone . The termination of ...
الصفحة 391
... Llanerchymedd ( 322-350 . ) . By this change both the coarse ( 322-330 . ) and fine grained ( 331-335 . ) , ( 341 , 342. ) varieties assume a more compact texture , arising from an intimate union , and greater degree of crystallization ...
... Llanerchymedd ( 322-350 . ) . By this change both the coarse ( 322-330 . ) and fine grained ( 331-335 . ) , ( 341 , 342. ) varieties assume a more compact texture , arising from an intimate union , and greater degree of crystallization ...
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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