Aids in Practical Geology |
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Page 140
... posterior to the quartz . b , Liquid- enclosures with bubbles and cubic crystals separated from the super- saturated solution . In quartz of tourmaline - granite - Great Staple Tor , Dartmoor . × 320. c , Structures produced by ...
... posterior to the quartz . b , Liquid- enclosures with bubbles and cubic crystals separated from the super- saturated solution . In quartz of tourmaline - granite - Great Staple Tor , Dartmoor . × 320. c , Structures produced by ...
Page 314
... posteriorly in a more or less sharp Beak or Umbo . An aperture , the Foramen , may occur in this , or just below it , serving for the exit of the fibrous pedicle by which the animal was attached . When below the beak , it is generally ...
... posteriorly in a more or less sharp Beak or Umbo . An aperture , the Foramen , may occur in this , or just below it , serving for the exit of the fibrous pedicle by which the animal was attached . When below the beak , it is generally ...
Page 322
... posterior . The longer part is in One or other valve may become smaller ; but in these inequi- valve genera the inequilateral character will probably betray itself ( fig . 72 ) . Similarly some genera have shells that are practically ...
... posterior . The longer part is in One or other valve may become smaller ; but in these inequi- valve genera the inequilateral character will probably betray itself ( fig . 72 ) . Similarly some genera have shells that are practically ...
Page 323
... Posterior Border . - The end of the shell where the cloacal aperture and , in siphonate forms , the siphons , were situated . Umbo . - The beak or apex of either valve . This in the majority of forms is directed forwards - i.e ...
... Posterior Border . - The end of the shell where the cloacal aperture and , in siphonate forms , the siphons , were situated . Umbo . - The beak or apex of either valve . This in the majority of forms is directed forwards - i.e ...
Page 324
... posterior ) , sometimes two , are present in each valve . When the two impressions are fairly equal in area , the shell is that of a Homomyarian ; when the anterior impression is smaller , it is that of a Heteromyarian . The animals ...
... posterior ) , sometimes two , are present in each valve . When the two impressions are fairly equal in area , the shell is that of a Homomyarian ; when the anterior impression is smaller , it is that of a Heteromyarian . The animals ...
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Common terms and phrases
abundant acid altered amphibole andesites angle appear assay augite axis balsam basal bead become biotite blowpipe blue brown calcite carbonate character cleavage cobalt colour colourless common commonly compact constituents Cretaceous crossed nicols crystalline crystals dark decomposed deposits developed encrustation epidote eurites felspar flame foliated forms fossils fragments fused garnet Geol gives glass Gotlandian grains granite granular granules green groundmass H Cl hinge-line hornblende igneous rocks iron Journ lavas leucite limestones liquid lithoidal magnetite marked mass mica microscope minerals minute nepheline Nosean observed occur olivine opaque ophitic optic ordinary orthoclase oxide pale parallel particles perpendicular Plagioclase planes plates pleochroism polarised porphyritic posterior powder prismatic prisms pyroxene quartz radial reaction Refr refractive resemble residue rhombic rhyolites rotation schists sections seen septa serpentine shell silica soda sometimes specific gravity specimens spherulites structure sulphur surface trace trachytic tube types typical umbo valve vibration-traces
Popular passages
Page 63 - Micro-Structure of Metals and Alloys. — Economic Considerations. " No English text-book at all approaches this in the COMPLETENESS with which the most modern views on the subject are dealt with. Professor Austen's volume will be INVALUABLE, not only to the student, but also to those whose knowledge of the art is far advanced.
Page 33 - TRAVERSE TABLES: Computed to Four Places of Decimals for every Minute of Angle up to 100 of Distance. For the Use of Surveyors and Engineers. BY RICHARD LLOYD GURDEN, Authorised Surveyor for the Governments of New South Wales and Victoria, *»* Published with the Concurrence oj the Surveyors- General for New South Wales and Victoria. "Those who have experience in exact SURVEY-WORK will best know how to appreciate the enormous amount of labour represented by this valuable book.
Page 35 - A MANUAL OF APPLIED MECHANICS : Comprising the Principles of Statics and Cinematics, and Theory of Structures, Mechanism, and Machines. With Numerous Diagrams. Crown 8vo, cloth, 12s. 6d. FOURTEENTH EDITION. II. A MANUAL OF CIVIL ENGINEERING : Comprising Engineering Surveys, Earthwork, Foundations, Masonry, Carpentry, Metal Work, Roads, Railways, Canals, Rivers, Waterworks, Harbours, &c.
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Page 85 - SKETCHES OF BRITISH BIRDS IN THEIR HAUNTS. BY CHARLES DIXON. The Spacious Air. — The Open Fields and Downs. — In the Hedgerows.— On Open ; Heath and Moor. — On the Mountains. — Amongst the Evergreens. — Copse and Woodland. — By Stream and Pool. — The Sandy Wastes and Mudflats.— Sea-laved Rocks.— Birds of the Cities.— INDEX. "Enriched with excellent illustrations. A welcome addition to all libraries.