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Stratigraphical geology and palaeontology Manual of geology
- Titel
- Stratigraphical geology and palaeontology
- Autor
- Etheridge, Robert
- Erscheinungsort
- London
- Bandzählung
- 2
- Erscheinungsdatum
- 1885
- Umfang
- XXIV, 712 S.
- Sprache
- English
- Signatur
- VII 1596 8. (2)
- Vorlage
- Universitätsbibliothek Freiberg
- Digitalisat
- Universitätsbibliothek Freiberg
- Digitalisat
- SLUB Dresden
- Lizenz-/Rechtehinweis
- Public Domain Mark 1.0
- URN
- urn:nbn:de:bsz:14-db-id5121650763
- PURL
- http://digital.slub-dresden.de/id512165076
- OAI-Identifier
- oai:de:slub-dresden:db:id-512165076
- SLUB-Katalog (PPN)
- 512165076
- Sammlungen
- Bestände der Universitätsbibliothek Freiberg
- LDP: UB Freiberg Druckschriften
- Strukturtyp
- Band
- Parlamentsperiode
- -
- Wahlperiode
- -
- Titel
- Part III.—Upper Palæozoic Strata
- Digitalisat
- SLUB Dresden
- Strukturtyp
- Kapitel
- Parlamentsperiode
- -
- Wahlperiode
- -
Inhaltsverzeichnis
- Mehrbändiges WerkManual of geology
- BandStratigraphical geology and palaeontology -
- EinbandEinband -
- AbbildungGeological Map Of The British Islands -
- TitelblattTitelblatt III
- KapitelPreface V
- InhaltsverzeichnisSynopsis Of Contents VII
- RegisterTabular Summaries XIX
- RegisterList Of Plates XXIII
- KapitelIntroduction 1
- Kapitel[Part I.—Lower Palæozoic Strata] 2
- KapitelPart II.—Middle Palæozoic Strata 151
- KapitelPart III.—Upper Palæozoic Strata 212
- KapitelPart IV.—Dyas 306
- KapitelPart V.—Triassic Rocks [Mesozoic Or Secondary] 325
- KapitelPart VI.—Jurassic Or Oolitic Period 348
- KapitelPart VII.—Upper Mesozoic Strata 512
- KapitelPart VIII.—Canozoic Or Tertiary Period 598
- RegisterCorrigenda Et Errata 692
- RegisterIndex 693
- EinbandEinband -
- BandStratigraphical geology and palaeontology -
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242 MANUAL OF GEOLOGY. The lower series of coals are worked, only along or around the out crop or edges of the coal-basin, as at Yate and Kingswood, in the northern area, and Bedminster, Twerton, Mells, Vobster, Ashton, &c., in the southern; the extreme depth (5000 feet) and the “ Pennant rock ” forbidding any attempt to win coals in the centre of the southern area. The whole of the northern area or northern part of the coal-field at Kingswood has been elevated higher than the Somer setshire end of the basin, and has, therefore, been more denuded away. Only four workable coal-seams occur in the northern area. In the southern or Radstock basin six seams occur. The Bristol coal-field, although not the most easterly in England, appears nevertheless to be most nearly related to, if not connected with, the western portion of Europe through the probable extension of the coal-fields of Belgium (Mons, Valenciennes, &c.) The line of connection or axis may be through or along the Mendip Hills, east ward to Belgium (axis of Artois). It is conjectured that eastward of the Bristol coal-field another coal tract may occur under the south eastern counties of England (Kent and Sussex), having direct connec tion with the Belgian deposits. This question formed an important item of inquiry by the Royal Commission. The resources of the Bristol coal-field are extensive, but large deductions must be made for the disturbed and folded strata on the south side of the basin, for the great depth at which coals lie buried, and also for the thinness of many of the seams, which renders them unavailable at great depths. No coal-field in Britain has strata so disturbed through faulting and dislocation. The whole series is com pressed into a comparatively narrow trough from east to west, and the southern area has received great north and south flexures. In the Mendip area the coal-seams are vertical or even overthrown. Thinner seams are worked in the Bristol basin than in any other coal-field in Britain. Looking at the future of the Bristol coal-field, based upon the present yield or output, there is coal enough to last nearly two thousand years. It must be borne in mind, however, that, considering its capabilities, the resources are little drawn upon, and the coal-field is capable of yielding five times the quantity now withdrawn from its great store. The original quantity of coal, according to Professor Hull, after the necessary corrections for denudation, is estimated at 4148 millions of tons. Deducting from this one-third for inaccessible and spoiled coals, and one-tenth for those worked out, with the usual restriction as to depth (4000 feet), we have stored away for future use in this coal-field 2000 million tons of available fuel. The present output is only 1,000,000 tons, the produce of thirty-four collieries. The following estimate, however, by Professor Prestwich, in his Report upon this coal-field for the Royal Commission, differs from that of Professor Hull, and is the result of a more recent and search ing survey :—
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