Delete Search...
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 V.—Triassic Rocks [Mesozoic Or Secondary]
- 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 -
- Links
-
Downloads
- Download single page (JPG)
-
Fulltext page (XML)
332 MANUAL OF GEOLOGY. The upper bed has been worked through only at Northwich and Law ton. No marine remains occur with the salt, or in any way associated with it. The purest part in the upper bed is about three or four yards above the bottom, and about four feet in thickness ; the purest part of the lower bed occurs twenty or twenty-five yards deep, and is five or six yards thick, below which the salt becomes earthy, as above. This is the part worked. The salt is not stratified, but divided into vertical prisms of various polyhedral forms, and different dimensions, sometimes a yard or more in diameter. The sides of these prisms consist of pure white salt. Gypsum abounds in the marls associated with the salt, the most abundant variety being the fibrous kind, which traverses the marls in net-like ramifications. Probably what is now the salt-field was once a salt-water lake, separated from the sea by some natural barrier; the evaporation of the water caused supersaturation and precipitation of the salt, which subsequently became covered with the laminated marls. The lake or lagoon may have been fed by saline water through river action or the draining of Palozoic rocks, the conditions resembling those of the Jordan and Dead Sea at the present time—supersaturation only causing the accumulation, there being no outlet to the waters of this inland sea. Rock-salt is a frequent but not an exclusive production of the red marl and red sandstone, the mines of Wielitzka being in Tertiary sand, those in the Salzburg Alps in limestone of the Jurassic period. By far the larger proportion of ordinary springs, from whatever strata they issue, yield chloride of sodium, sometimes in very large quantity, and it is important to know that bromine and iodine, which are stated to be always existent in the actual sea-water, very gene rally accompany the muriatic salts in common springs. The rock-salt of Cheshire is believed to be entirely devoid of bromine and iodine, though the brine springs of the same district are found to contain both. Absence of the Muschelkalk in Britain.—One distinctive feature in the Trias of England, as distinguished from that of Germany and France, is the absence of the Muschelkalk or central calcareous mem ber. This absence must not of itself be taken as evidence of uncon formability ; it was a break in the succession through local changes in the physical geography of the Triassic area during the deposition of the Bunter and Keuper strata, or through such depression over the area in Europe where the Muschelkalk is developed as would allow of the interpolation of a special marine fauna whose general facies was not lost all through the Keuper period, as proved by the deposition of the St. Cassian, Hallstadt, and Kossen beds, finally culminating in the deposition of the Rhaetic series, a transitional group from the Trias into the Lias. The variable nature of the Triassic strata, and the con ditions under which they were deposited, must not be overlooked when the European series are correlated with those of Britain.
- Current page (TXT)
- METS file (XML)
- IIIF manifest (JSON)
- Show double pages
- Thumbnail Preview