Transactions of the Cambridge Philosophical SocietyUniversity Press, 1822 |
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الصفحة 91
... limestone on the banks of the Avon , may be found among the schistose rocks of Devon- shire . What has been said refers only to those parts examined by myself , and from which the specimens in our Museum have been selected * . The slaty ...
... limestone on the banks of the Avon , may be found among the schistose rocks of Devon- shire . What has been said refers only to those parts examined by myself , and from which the specimens in our Museum have been selected * . The slaty ...
الصفحة 93
... limestone , and belonging to an earlier epoch . The existence of organic remains in calcareous beds , which alternate with rocks where some of the other earths predominate , and in which we trace no vestige of previous animal existence ...
... limestone , and belonging to an earlier epoch . The existence of organic remains in calcareous beds , which alternate with rocks where some of the other earths predominate , and in which we trace no vestige of previous animal existence ...
الصفحة 141
... limestone , of very irregular extent and thickness , are interstratified with the killas , in many parts of Devonshire . They all possess , in a more or less perfect degree Professor SEDGWICK on the Geology of Cornwall , & c . 141.
... limestone , of very irregular extent and thickness , are interstratified with the killas , in many parts of Devonshire . They all possess , in a more or less perfect degree Professor SEDGWICK on the Geology of Cornwall , & c . 141.
الصفحة 142
... limestone ; and often pass , by almost insensible gradations , into the schistose masses to which they are subordinate . They generally present such certain traces of organic remains , as prove beyond a possibility of doubt , that all ...
... limestone ; and often pass , by almost insensible gradations , into the schistose masses to which they are subordinate . They generally present such certain traces of organic remains , as prove beyond a possibility of doubt , that all ...
الصفحة 143
... limestone which alternate with the dark laminæ of the schist , and follow their line of curva- ture . Some of these beds are so singularly coiled on each other , that their exposed surfaces resemble a set of cylindrical pipes , of ...
... limestone which alternate with the dark laminæ of the schist , and follow their line of curva- ture . Some of these beds are so singularly coiled on each other , that their exposed surfaces resemble a set of cylindrical pipes , 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