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  • 1
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    Braided Rivers (1993)
    London : The Geological Society
    Details
    Keywords: Sedimentologie ; Flusssediment ; Flussbett ; Flussmäander ; Fluviale Sedimentation ; Geomorphogenese ; Acao Dos Rios (Geologia) ; Alluvial streams ; Rivieren ; Sediment transport ; Sedimentologia
    Description / Table of Contents: C. S. Bristow and J. L. Best: Braided rivers: perspectives and problems / Geological Society, London, Special Publications, 75:1-11, doi:10.1144/GSL.SP.1993.075.01.01 --- John S. Bridge: The interaction between channel geometry, water flow, sediment transport and deposition in braided rivers / Geological Society, London, Special Publications, 75:13-71, doi:10.1144/GSL.SP.1993.075.01.02 --- R. I. Ferguson: Understanding braiding processes in gravel-bed rivers: progress and unsolved problems / Geological Society, London, Special Publications, 75:73-87, doi:10.1144/GSL.SP.1993.075.01.03 --- N. J. Clifford, J. Hardisty, J. R. French, and S. Hart: Downstream variation in bed material characteristics: a turbulence-controlled form-process feedback mechanism / Geological Society, London, Special Publications, 75:89-104, doi:10.1144/GSL.SP.1993.075.01.04 --- P. F. Friend and R. Sinha: Braiding and meandering parameters / Geological Society, London, Special Publications, 75:105-111, doi:10.1144/GSL.SP.1993.075.01.05 --- M. S. E. Robertson-Rintoul and K. S. Richards: Braided-channel pattern and palaeohydrology using an index of total sinuosity / Geological Society, London, Special Publications, 75:113-118, doi:10.1144/GSL.SP.1993.075.01.06 --- J. O. Leddy, P. J. Ashworth, and J. L. Best: Mechanisms of anabranch avulsion within gravel-bed braided rivers: observations from a scaled physical model / Geological Society, London, Special Publications, 75:119-127, doi:10.1144/GSL.SP.1993.075.01.07 --- Peter Ashmore: Anabranch confluence kinetics and sedimentation processes in gravel-braided streams / Geological Society, London, Special Publications, 75:129-146, doi:10.1144/GSL.SP.1993.075.01.08 --- Christoph Siegenthaler and Peter Huggenberger: Pleistocene Rhine gravel: deposits of a braided river system with dominant pool preservation / Geological Society, London, Special Publications, 75:147-162, doi:10.1144/GSL.SP.1993.075.01.09 --- Peter Huggenberger: Radar facies: recognition of facies patterns and heterogeneities within Pleistocene Rhine gravels, NE Switzerland / Geological Society, London, Special Publications, 75:163-176, doi:10.1144/GSL.SP.1993.075.01.10 --- Peter A. Bentham, Peter J. Talling, and Douglas W. Burbank: Braided stream and flood-plain deposition in a rapidly aggrading basin: the Escanilla formation, Spanish Pyrenees / Geological Society, London, Special Publications, 75:177-194, doi:10.1144/GSL.SP.1993.075.01.11 --- Keith Richards, Shobhit Chandra, and Peter Friend: Avulsive channel systems: characteristics and examples / Geological Society, London, Special Publications, 75:195-203, doi:10.1144/GSL.SP.1993.075.01.12 --- David G. Passmore, Mark G. Macklin, Paul A. Brewer, John Lewin, Barbara T. Rumsby, and Malcolm D. Newson: Variability of late Holocene braiding in Britain / Geological Society, London, Special Publications, 75:205-229, doi:10.1144/GSL.SP.1993.075.01.13 --- David J. Gilvear: River management and conservation issues on formerly braided river systems; the case of the River Tay, Scotland / Geological Society, London, Special Publications, 75:231-240, doi:10.1144/GSL.SP.1993.075.01.14 --- J. Warburton, T. R. H. Davies, and M. G. Mandl: A meso-scale field investigation of channel change and floodplain characteristics in an upland braided gravel-bed river, New Zealand / Geological Society, London, Special Publications, 75:241-255, doi:10.1144/GSL.SP.1993.075.01.15 --- Colin R. Thorne, Andrew P. G. Russell, and Muhammad K. Alam: Planform pattern and channel evolution of the Brahmaputra River, Bangladesh / Geological Society, London, Special Publications, 75:257-276, doi:10.1144/GSL.SP.1993.075.01.16 --- C. S. Bristow: Sedimentary structures exposed in bar tops in the Brahmaputra River, Bangladesh / Geological Society, London, Special Publications, 75:277-289, doi:10.1144/GSL.SP.1993.075.01.17 --- C. S. Bristow: Sedimentology of the Rough Rock: a Carboniferous braided river sheet sandstone in northern England / Geological Society, London, Special Publications, 75:291-304, doi:10.1144/GSL.SP.1993.075.01.18 --- Andrew D. Miall: The architecture of fluvial-deltaic sequences in the Upper Mesaverde Group (Upper Cretaceous), Book Cliffs, Utah / Geological Society, London, Special Publications, 75:305-332, doi:10.1144/GSL.SP.1993.075.01.19 --- John H. Martin: A review of braided fluvial hydrocarbon reservoirs: the petroleum engineer’s perspective / Geological Society, London, Special Publications, 75:333-367, doi:10.1144/GSL.SP.1993.075.01.20 --- W. P. Karpeta: Sedimentology and gravel bar morphology in an Archaean braided river sequence: the Witpan Conglomerate Member (Witwatersrand Supergroup) in the Welkom Goldfield, South Africa / Geological Society, London, Special Publications, 75:369-388, doi:10.1144/GSL.SP.1993.075.01.21 --- Lisa Edgington and Neil Harbury: Provenance of braided alluvial deposits of the Thari Formation, Rhodes, SE Aegean: evidence for major erosion of an ophiolite-bearing thrust sheet / Geological Society, London, Special Publications, 75:389-403, doi:10.1144/GSL.SP.1993.075.01.22 --- Victoria R. Copley and John McM. Moore: Debris provenance mapping in braided drainage using remote sensing / Geological Society, London, Special Publications, 75:405-412, doi:10.1144/GSL.SP.1993.075.01.23
    Pages: Online-Ressource (VII, 419 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 0903317931
    URL: http://sp.lyellcollection.org/content/75/1
    Language: English
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    E-BOOK
  • 2
    Electronic Resource
    Electronic Resource
    The sedimentary structure of linear sand dunes (2000)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 406 (2000), S. 56-59 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Linear sand dunes—dunes that extend parallel to each other rather than in star-like or crescentic forms—are the most abundant type of desert sand dune. But because their development and their internal structure are poorly understood, they are rarely recognized in the rock ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35017536
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    Paper (German National Licenses)
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  • 3
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    Sea-level controls on carbonate beaches and coastal dunes (eolianite): Lessons from Pleistocene Bermuda (2015)
    Geological Society of America (GSA)
    Details
    Publication Date: 2015-10-28
    Description: Coastal dune accumulations at locations around the world have formed during sea-level highstands, rising sea levels, falling sea levels, and fluctuating sea levels. Initially, episodes of maximum Pleistocene dune activity in Bermuda, which is the type location for eolianite, were correlated with glacio-eustatic regressions. This model had been abandoned by the 1970s in favor of a rising sea-level model for Bermuda’s north shore and autogenic sediment-supply model for the south shore. We report the results of a detailed investigation of the intercalated mid-late Pleistocene beach and coastal dune deposits on the islands of Bermuda, and we test the existing models for these deposits. We contend that the north shore model is invalidated by past misidentification of eolian deposits as transgressive beach deposits. On the south shore, facies analysis of the marine isotope stage 7 (MIS 7) Belmont Formation reveals that coastal deposition was divided into two phases. S1, which includes foreshore and shoreface progradation, is predominantly marine and coincided with rising relative sea level. S2, which commenced with protosol development on top of the marine section prior to burial by advancing dunes, is nonmarine. We conclude that the two successions S1 and S2 resulted from forcing by glacio-hydro-isostatic relative sea-level change spanning a highstand (rising and then falling), rather than from transgressive or autogenic processes. The finding that, in Bermuda, the construction of protective coastal dunes depends on a falling relative sea level has potential implications for many vulnerable shorelines that face rising relative sea levels associated with climate change.
    Print ISSN: 0016-7606
    Electronic ISSN: 1943-2674
    Topics: Geosciences
    Published by Geological Society of America (GSA)
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  • 4
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    Ancient watercourses and biogeography of the Sahara explain the peopling of the desert (2010)
    National Academy of Sciences
    Details
    Publication Date: 2010-12-27
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 5
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    Lake Mega-Chad fluctuation since the LGM [Earth, Atmospheric, and Planetary Sciences] (2015)
    National Academy of Sciences
    Details
    Publication Date: 2015-07-15
    Description: From the deglacial period to the mid-Holocene, North Africa was characterized by much wetter conditions than today. The broad timing of this period, termed the African Humid Period, is well known. However, the rapidity of the onset and termination of the African Humid Period are contested, with strong evidence for...
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 6
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    Ancient watercourses and biogeography of the Sahara explain the peopling of the desert [Geology] (2011)
    National Academy of Sciences
    Details
    Publication Date: 2011-01-12
    Description: Evidence increasingly suggests that sub-Saharan Africa is at the center of human evolution and understanding routes of dispersal “out of Africa” is thus becoming increasingly important. The Sahara Desert is considered by many to be an obstacle to these dispersals and a Nile corridor route has been proposed to cross it. Here we provide evidence that the Sahara was not an effective barrier and indicate how both animals and humans populated it during past humid phases. Analysis of the zoogeography of the Sahara shows that more animals crossed via this route than used the Nile corridor. Furthermore, many of these species are aquatic. This dispersal was possible because during the Holocene humid period the region contained a series of linked lakes, rivers, and inland deltas comprising a large interlinked waterway, channeling water and animals into and across the Sahara, thus facilitating these dispersals. This system was last active in the early Holocene when many species appear to have occupied the entire Sahara. However, species that require deep water did not reach northern regions because of weak hydrological connections. Human dispersals were influenced by this distribution; Nilo-Saharan speakers hunting aquatic fauna with barbed bone points occupied the southern Sahara, while people hunting Savannah fauna with the bow and arrow spread southward. The dating of lacustrine sediments show that the “green Sahara” also existed during the last interglacial (∼125 ka) and provided green corridors that could have formed dispersal routes at a likely time for the migration of modern humans out of Africa.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 7
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    Ground-penetrating radar stratigraphy and dynamics of megaflood gravel dunes (2016)
    Geological Society of London
    Details
    Publication Date: 2016-05-04
    Description: Ground-penetrating radar was used to elucidate the stratigraphy of late Pleistocene gravel dunes in the Altai Mountains of southern Siberia that formed when a lake emptied as a result of ice-dam failure. Survey-lines across dunes had a resolution of decimetres, with depth penetration of 20 m. The reflections identify bounding surfaces and radar facies. Two classes of unconformities are identified: (1) an erosional unconformity at the base of the dunes; (2) steeply inclined unconformities that truncate underlying inclined reflections and are downlapped by overlying inclined reflections within the dunes. Unconformities define six radar facies (RF): RF 1, basal subhorizontal discordant reflections; RF 2, poorly defined discordant reflections; RF 3, planar inclined reflections; RF 4, sigmoidal inclined reflections; RF 5, trough fills; RF 6, low-angle inclined reflections. The basal unconformity represents the flood-cut surface, across which the dunes migrated. The inclined unconformities may be interpreted in two ways: (1) erosional surfaces induced by unsteady flow within one flood, or (2) erosional surfaces developed by a series of floods reactivating dunes left stranded by previous floods. The evidence favours the latter model, which is consistent with the occurrence of several dune-forming events within the basin. The broader implications of the study are considered with respect to investigations of megaflood bedforms worldwide.
    Print ISSN: 0016-7649
    Topics: Geosciences
    Published by Geological Society of London
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  • 8
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    Quantifying rates of coastal progradation from sediment volume using GPR and OSL: the Holocene fill of Guichen Bay, south-east South Australia (2006)
    Wiley
    Details
    Publication Date: 2006-08-01
    Print ISSN: 0037-0746
    Electronic ISSN: 1365-3091
    Topics: Geosciences
    Published by Wiley
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  • 9
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    A simple magma-mixing model for sulphur behaviour in calc-alkaline volcanic rocks: mineralogical evidence from Mount Pinatubo 1991 eruption (1992)
    Geological Society of London
    Details
    Publication Date: 1992-11-01
    Print ISSN: 0016-7649
    Topics: Geosciences
    Published by Geological Society of London
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  • 10
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    Three-Dimensional Sedimentary Architecture of a Large, Mid-Channel Sand Braid Bar, Jamuna River, Bangladesh (2003)
    Society for Sedimentary Geology
    Details
    Publication Date: 2003-07-01
    Print ISSN: 1527-1404
    Electronic ISSN: 1938-3681
    Topics: Geosciences
    Published by Society for Sedimentary Geology
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