The Quarterly Journal of the Geological Society of London, Volume 64The Society, 1908 - Electronic journals Vols. 1-108 include Proceedings of the society (separately paged, beginning with v. 30) |
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Page xvi
... portion of the palatal aspect of Metriorhynchus brachyrhynchus 352 2. Sections of the nasal canals of Metriorhynchus brachyrhynchus . 354 1. Map of the Porth - clais area .. 378 2. Cambrian conglomerate involved in a basic intrusion ...
... portion of the palatal aspect of Metriorhynchus brachyrhynchus 352 2. Sections of the nasal canals of Metriorhynchus brachyrhynchus . 354 1. Map of the Porth - clais area .. 378 2. Cambrian conglomerate involved in a basic intrusion ...
Page 34
... portion lies in Staffordshire . In the Geological - Survey Memoir on North Derbyshire , the Carboniferous - Limestone succession of this area , as shown by the extensive section between Buxton and Monsal Dale , is briefly described1 ...
... portion lies in Staffordshire . In the Geological - Survey Memoir on North Derbyshire , the Carboniferous - Limestone succession of this area , as shown by the extensive section between Buxton and Monsal Dale , is briefly described1 ...
Page 36
... portion of the area is now being worked out by Mr. C. B. Wedd , of H.M. Geological Survey , in the course of the re ... portions of the sequence . The base of the Carboniferous Limestone is not visible in the Midland area , and the whole ...
... portion of the area is now being worked out by Mr. C. B. Wedd , of H.M. Geological Survey , in the course of the re ... portions of the sequence . The base of the Carboniferous Limestone is not visible in the Midland area , and the whole ...
Page 60
... portion about 100 ... That part of the section which comprised ( 2 ) , ( 3 ) , & ( 4 ) is now over- grown , but the whole series of cherty limestones ( 1 ) is excellently displayed . As a whole , the cherty - limestone series is poorly ...
... portion about 100 ... That part of the section which comprised ( 2 ) , ( 3 ) , & ( 4 ) is now over- grown , but the whole series of cherty limestones ( 1 ) is excellently displayed . As a whole , the cherty - limestone series is poorly ...
Page 61
... portion of the thick tuff seen in Tissington cutting , the Cyatha.conia - subzone attains , in this neighbourhood , a thickness of well over 200 feet . About 100 feet of the subzone are represented above the tuff in Tissington cutting ...
... portion of the thick tuff seen in Tissington cutting , the Cyatha.conia - subzone attains , in this neighbourhood , a thickness of well over 200 feet . About 100 feet of the subzone are represented above the tuff in Tissington cutting ...
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Common terms and phrases
abundant amphibolite angle anticline antigorite appears augite bands boulders brachiopods calcareous calcite Cambrian Carboniferous cent centimetres Chalk character chert clay cleavage Colonsay conglomerate Cyathaxonia-Beds David's deposits described diameter district Dolhir Drift dykes east enstatite evidence exposed exposures Farnham fault feet felspar fine-grained folding fossils fragments Geol Geological glacial beds Glyn gneiss grains granite granophyre gravel Grit Hill horizon hornblende igneous inches intrusion Journ junction lamprophyre limestone Llandovery locality Loughshinny lower M'Coy margin mass material Metriorhynchus miles millimetres mineral Miocene monoclinic numerous occur olivine origin Orthis outcrop paper Pebidian phyllite plane PLATE portion present probably Productus Prof pyroxene quarry quartz quartzites ridge River rocks sand sandstone schists seen serpentine shales shown side slates species specimens Spirifer stream structure subzone surface Surv Thayetmyo thickness tuffs upper valley Wenlock zone
Popular passages
Page 140 - In Logan's original classification of the Laurentian this term — apart from the Upper Laurentian which was proved to be composed essentially of anorthosite intrusions — included two series differing in character, namely, the Lower Orthoclase (Fundamental Gneiss) and the Grenville series. Now that investigations have shown that these two series differ in origin, one being essentially a great development of very ancient sediments, and the other consisting of great bodies of igneous rock intruded...
Page 126 - Towards the north-west, however, the granite, in ever-increasing amount, arches up the sedimentary series and wells up through it, in places disintegrating it into a breccia composed of shreds and patches of the invaded rock scattered through the invading granite, until eventually connected areas of the sedimentary series disappear entirely and over hundreds of square miles the granite and granite-gneiss alone are seen, holding, however, in almost every exposure, inclusions which represent the last...
Page 134 - Certain granular amphibolites represent altered igneous intrusions, for they are found in the form of dykes cutting across the stratified white crystalline limestone, on the shores of Jack's Lake in the township of Methuen. The limestones here dip at a low angle to the south, and are excellently exposed in the form of low cliffs about the side of the lake.
Page cxi - Balk will, who has filled the office of honorary treasurer for the last nine years and has now found himself unable to continue in the position. His books have been kept with great neatness and accuracy, and his attention to the business of the Society has always been prompt and...
Page 663 - ... to accompany the medal, the remaining interest to be given in one or more portions, at the discretion of the council, for the encouragement of geology or of any of the allied sciences by which they shall consider geology to have been most materially advanced, either for travelling expenses or for a memoir or paper published or in progress, and without reference to the sex or nationality of the author or the language in which any such memoir or paper may be written.
Page 133 - These amphibolites are not peculiar to this area, but occur abundantly everywhere in the Laurentian. They have always proved to be one of the chief difficulties in the way of a correct understanding of the geology of this system, seeing that it has been impossible to do more than indulge in conjectures concerning their origin. The same difficulty has been...
Page 663 - as an acknowledgment of eminent services in any department of Geology, irrespective of the receiver's country ; but he must not be older than 45 years at his last birthday, thus probably not too old for further work, and not too young to have done much.
Page 134 - I remarkable convergence of type, whereby rocks of widely different origin come to assume identity of character, explains the difficulty which has been experienced up to the present time in arriving at a satisfactory conclusion concerning their genetic relations. (a) Some of these amphibolites result from the metamorphism and recrystallization of sediments. To this class belong the feather-amphibolites above described, which usually occur in thin bands alternating with crystalline limestone, and...
Page 142 - ... however, probably developed only a small part of the space which the granite now occupies ; (5) the invading granite not only exerted a mechanical action upon the invaded strata, but also gave rise to a variety of metamorphic products, among others amphibolite produced by its action in the limestone, which accounts for the fact that while the invaded strata are chiefly limestone, the fragments of the latter, where found in the granite, consist of amphibolite ; (6) the invading bathyliths...
Page 142 - The granite-gneiss of the bathyliths not only arched up the invaded strata into a series of domes, but ' stoped ' out portions of the sides and lower surface of the arches, the fragments torn off from walls and roof by the invading granite being found scattered throughout the mass of the invading rock : this