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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 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 -
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FAUNA OF THE TRIASSIC ROCKS. 333 Dolomitic Conglomerate. Local Distribution.—Probably the Dolomitic Conglomerate of the Bristol area may occupy the same stratigraphical position as the Muschelkalk ; it occurs only and entirely within the Bristol coal basin, or upon those older rocks comprising it. 1 In the southern portion of the coalfield, or between Bristol and the northern flanks of the Mendip Hills, it is the so-called “overlie” of the colliers. Few pits are sunk in which the Dolomitic Conglomerate is not seen to un- conformably cover and overlie the coal-measures. It marked a shore line in Triassic times, and now occupies the same position ; and it must also have been extensively spread out, or over a shallow sea-bed or lake; it averages about 20 feet in thickness, but frequently rises here and there into bold and picturesque cliffs 40 to 50 feet high. This conglomerate (in places a breccia) is a marked feature in the physical structure of the Bristol coal-field, to be understood only in connection with the limited and complicated area occupied by the Palaeozoic rocks of the Bristol and southern part of the South Wales coalfield. 2 This conglomerate has yielded two genera of Dinosauria, 3 Thecodontosaurus and Paloeosaurus. The contained or derived rocks are chiefly Carboniferous limestone, Millstone Grit, and Coal-measure sand stones, cemented together by carbonate of lime, iron oxide, and mag nesia, whence the name “Dolomitic or Magnesian Conglomerate.” Beds of yellow, fine-grained, thick-bedded impure Magnesian limestone are conspicuous on the coast near Clevedon in Somersetshire, and also on the Glamorganshire coast—they lie above the conglomerate, and pass into the Red sands and marls above. Fauna of the Triassic Rochs. The organic remains of the Bunter and Keuper are comparatively few. The conditions for life or preservation could hardly have been congenial. The land possessed a flora which, from the fragments known, must have consisted of large, cypress-like, coniferous trees, Voltzia, Wadchia, Catamites, &c. A small bivalve crustacean, Esthena {E. minuta), abounds in places in the white and red marls, associated with Pullastra arenicola, a bivalve shell which is common through the uppermost portion of the Keuper marls and Rhaetic beds, but does not range into the Lower Lias. The Keuper marls and sandstones in Worcestershire and Warwickshire contain, near their upper part, and in marly concretions or thin lenticular beds, many fish- remains, mostly represented by teeth and dorsal spines or defences belonging to the genera Hybodus (H. Keuperi, H. minor), Acrodus (A. minimus), Lopkodus 1 The conglomerate occurs on the south side of the Mendip Hills, resting upon the Carboniferous and Old Red sandstone series. South of this range there is little doubt that an extensive coalfield occurs, although hidden by the newer rocks. 2 Vide Etheridge, Q. Joum. Geol. Soc., vol. xxvi. p. 174, and Geological Ob server, De la Beche, pp. 476-496. 3 See Riley and Stuckbury, Geol. Trans., voL v., 2nd set., p. 349.
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