Abstract of the Proceedings of the Liverpool Geological Society, Volumen7 |
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Términos y frases comunes
1-20 inch mesh analyses angular basalt beds Blundellsands Boulder Clay Brockram Burnmouth calcareous calcite Cambrian carbonate of lime carbonic acid Carboniferous Limestone cemented chemical cliffs coast colour conglomerate containing crystals d'Orb débris denudation deposits described diabase DICKSON district drift Estuary examination fault feet felspar footprints fossils Geological Survey geologists glacial glacier granite grit H. C. Beasley iron Keuper Kirkby Stephen lake lime carbonate Liverpool LIVERPOOL GEOLOGICAL SOCIETY LOMAS magnesian marine marls mass material MELLARD READE mica miles Millstone Grit minerals Moel Tryfaen moraine mountain Museum nature observed occur Old Red oxide paper pebbles Permian Plate quarry quartz quartz grains Red Sandstone remarkable Ribble Ricketts river Road rock flour rocks rounded sands and gravels Science seen shales shell fragments shore side siliceous Silurian slate specimens stones Storeton strata stream striæ striated surface thickness Triassic valley
Pasajes populares
Página 346 - The Drift Beds of the Moel Tryfaen Area of the North Wales Coast On Researches in the newly-discovered 'Aerodias Bed...
Página 325 - ... 90 to 150 feet high. The strata consist mainly of marls and limestones, arenaceous deposits being rare ; and they form a continuous series from the base of the Cambrian to the top of the Silurian, the whole of these strata being in conformable succession and unconformably overlain by the Devonian. Although the representative of the Cambrian or Primordial Silurian contains neither Paradoxides nor Olenus, nor, indeed, any Trilobites whatever, but only Lmgulidte and Graptolites, yet its stratigraphies!
Página 325 - So perfectly are the two formations cemented together that it is possible to get hand specimens of the unconformity. It would appear that while the sediments of South Wales were being laid down in quiet waters from the beginning of the Upper Silurian to the close of the Carboniferous, the succession of events was several times broken in Scotland, as shown, not only by the strong unconformity already spoken of between the Upper Old Red and the Lower Silurian, which I have myself seen, but by the unconformity...
Página 76 - On Marine Shells in Stratified Drift at High Levels on Moel Tryfaen, Caernarvonshire.
Página 314 - The order of business at the meetings of the Society shall be as follows: 1. Reading of the minutes. 2. Recommendations and reports. 3. Elections. 4. Miscellaneous business. 5. Presentation and discussion of papers previously approved by the programme committee.
Página 151 - ... connection is that the fish are dependent upon the numerous amphipoda and other small animals which frequent the tufts of Flustra. The same locality may vary so much from time to time in the temperature, the salinity, and the transparency of the water, that it is probable that none of these factors — so long as the variations do not exceed certain limits — have so much influence upon the fauna as the nature of the deposit has. It is therefore quite to be expected that the fauna should vary...
Página 148 - Ophiothrix fragilis), which fill the dredge haul after haul. At two localities off the Isle of Man, viz., along the east coast from Clay Head to St. Ann's Head, and off the west coast between Contrary Head and Niarbyl, at depths between 10 and 20 fathoms, are great nullipore deposits formed of Melobesia and Lithothamnion, which have a most characteristic appearance, smell, and fauna.
Página 153 - Serpula, and of various echiuoderm plates and spines and the whole shells of Echinocyamus pusillus. The deposit, when it comes up in the dredge, is of a gleaming whiteness, and has a very characteristic appearance. Such a deposit as this would form a rock almost wholly made up of fossils, and might compare well with some Tertiary fossiliferous deposits, such as the Coralline Crag. A little further north, along the east coast of the Isle of Man, at about a corresponding depth and distance from land,...
Página 325 - Neither does the principle of isostacy so insisted upon by American geologists explain the compression, folding, and building up of great masses of sediment into mountain ranges. On the principle of isostacy, it must be obvious to anyone possessing even a rudimentary acquaintance with mechanics that the sinking of the bed of the seas on which great deposits are accumulating, and to some extent a rise of surrounding land, may be explained, but not the lateral compression and elevation of the sediments...
Página 33 - ... deposits are scantily represented by the coral reefs and raised beaches along the coast, the gypsum beds which occur on part of the coast, and the Nubian Sandstone which covers a considerable area in the western portion of the region. Besides these, alluvial deposits and accumulations of rock waste in the valleys and on the plains at the foot of the hills cover wide tracts, but igneous and metamorphic types of rocks form the surface over by far the larger part of this desert. The igneous rocks...