Transactions of the Cambridge Philosophical SocietyUniversity Press, 1822 |
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الصفحة 89
... Greywacké of Somersetshire . Structure of the Country between Dartmoor and Land's End . Granite and the rocks associated with it . § . 4 . Junction of the Killas and Granite , Granite . Veins , & c . , § . 5 . Elvan Courses , & c ...
... Greywacké of Somersetshire . Structure of the Country between Dartmoor and Land's End . Granite and the rocks associated with it . § . 4 . Junction of the Killas and Granite , Granite . Veins , & c . , § . 5 . Elvan Courses , & c ...
الصفحة 92
... greywacké rocks of the German school . Many beds are of silky lustre , and even when viewed with a lens , appear of homogeneous texture . But in the cliffs , and other places where the formation is best exposed , we find the finest ...
... greywacké rocks of the German school . Many beds are of silky lustre , and even when viewed with a lens , appear of homogeneous texture . But in the cliffs , and other places where the formation is best exposed , we find the finest ...
الصفحة 93
... greywacké , and which constantly present most indisputable traces of organic remains . Several specimens have been selected from these calcareous beds ; and from their external characters and geological situation , as well as from a ...
... greywacké , and which constantly present most indisputable traces of organic remains . Several specimens have been selected from these calcareous beds ; and from their external characters and geological situation , as well as from a ...
الصفحة 136
... greywacké rocks of Somersetshire , and some parts of North Devon , most remote from the primitive ridge : it might be presumed that these rocks gradually disappear as we recede from the granite . The supposition would however lead to ...
... greywacké rocks of Somersetshire , and some parts of North Devon , most remote from the primitive ridge : it might be presumed that these rocks gradually disappear as we recede from the granite . The supposition would however lead to ...
الصفحة 138
... greywacké . That rock is however rare in the district we are considering . For with the exception of some specimens we found a few miles to the west of Plymouth ; and some others we obtained from the cliffs near Mawnan , and from Nare ...
... greywacké . That rock is however rare in the district we are considering . For with the exception of some specimens we found a few miles to the west of Plymouth ; and some others we obtained from the cliffs near Mawnan , and from Nare ...
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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