ALBERT

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

Description / Table of Contents: Abstract Following a general review of the Cretaceous and Paleogene geology of Ecuador, we propose a geologic history from early Cretaceous through Oligocene time with emphasis on the coastal part of the country that is based on the interpretive interaction of three oceanic plates (the Bolívar, proto-Nazca, and Nazca) and the continental South American plate. The proposed history invokes large lateral displacements, the intervention of the previously unrecognized Bolívar plate, the development of three successive subduction zones, the formation of a distant oceanic island arc and its subsequent collision with the South American plate, the emplacement of a major olistostrome complex, and an intricate record of displacement on a currently inactive transform fault. The proposed history offers a viable solution to four major problems of the geology of coastal Ecuador.