Transactions of the Cambridge Philosophical SocietyUniversity Press, 1822 |
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الصفحة 92
... texture . But in the cliffs , and other places where the formation is best exposed , we find the finest grained beds alternating , often without any apparent order , with rocks which exactly agree with the definition of greywacké . The ...
... texture . But in the cliffs , and other places where the formation is best exposed , we find the finest grained beds alternating , often without any apparent order , with rocks which exactly agree with the definition of greywacké . The ...
الصفحة 93
... texture and generally micaceous . 7. A schistose amygdaloid ; the base a variety of clay - slate . 8. The fine homogeneous slate ; surface silky and of various cloudy colours ; in some instances micaceous , & c . The characters above ...
... texture and generally micaceous . 7. A schistose amygdaloid ; the base a variety of clay - slate . 8. The fine homogeneous slate ; surface silky and of various cloudy colours ; in some instances micaceous , & c . The characters above ...
الصفحة 96
... texture . That granite is the fundamental rock of the whole region , cannot admit of doubt . We are not left to form this opinion from analogies deduced from the relative situation of similar rocks in other countries . In passing from ...
... texture . That granite is the fundamental rock of the whole region , cannot admit of doubt . We are not left to form this opinion from analogies deduced from the relative situation of similar rocks in other countries . In passing from ...
الصفحة 101
... texture . But even in these instances , a fracture will often shew the crystals of felspar , passing from the surrounding granite into the imbedded nodule without any apparent interruption in their form . It would lead me into ...
... texture . But even in these instances , a fracture will often shew the crystals of felspar , passing from the surrounding granite into the imbedded nodule without any apparent interruption in their form . It would lead me into ...
الصفحة 106
... texture than the granite ; but varieties may be found , especially on the north side of Dartmoor , in which a very coarse granular base contains crystals of schorl several inches in length . 2. Where quartz prevails nearly to the ...
... texture than the granite ; but varieties may be found , especially on the north side of Dartmoor , in which a very coarse granular base contains crystals of schorl several inches in length . 2. Where quartz prevails nearly to the ...
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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