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This book is the second of three volumes in which the recent knowledge of the extent and chronology of Quaternary glaciations has been compiled on a global scale. This information is seen as a fundamental requirement, not only for the glacial community, but for the wider user-community of general Quaternary workers. In particular the need for accurate ice-front positions is a basic requirement for the rapidly growing field of palaeoclimate modelling. In order to provide the information for the widest-possible range of users in the most accessible form, a series of digital maps was prepared.The glacial limits were mapped in ArcView, the Geographical Information System (GIS) used by the work group. Included with the publication is a CD with digital maps, showing glacial limits, end moraines, ice-dammed lakes, glacier-induced drainage diversions and the locations of key sections through which the glacial limits are defined and dated. The last deglaciation is also shown in 500 year time-steps. The digital maps in this volume cover the USA and Canada and include Greenland and Hawaii. Both overview maps and more detailed maps at a scale 1: 1,000,000 are provided.Also available:Part I: Europe, ISBN 0-444-51462-7Part III: South America, Asia, Africa, Australia, Antarctica, ISBN 0-444-51593-3
A collection of regional papers on quaternary glaciation arepresented here under the major section headings of WesternCanada, Arctic Canada, and Eastern Canada.
This synthesis of the Quaternary geology of Canada and Greenland covers the regional Quaternary geology of Canada, applied Quaternary geology in Canada (including its influence on man's environment), the Quaternary geology of the ice-free areas of Greenland, and the dynamic and climatic history of the Greenland ice-sheet.
This volume covers the geological aspects of archaeology from both regional and topical perspectives in an attempt to reflect the diverse and heterogeneous nature of archaeological geology. of the 28 chapters, some are site-specific archaeological investigations that typify a variety of other sites. Others summarize the archaeological geology of re
Unconsolidated sediments in the Fort. St. John area include a twice repeated succession of gravel overlain by sand, silt, and clay, and each of these in t urn be till of eastern origin. Both succession are interpreted as: (1) gravel laid down by Peace River during or at the close of interglacial (and preglacial?) intervals, (2) fine sediments laid down in lakes ponded in Peace River valley by ice advancing from the east, and (3) till laid down after ice reached Fort St. John area. The younger till [early Wisconsin (?)] is covered by sediments, chiefly clay, from a series of proglacial lakes, and by local postglacial deposits. The topography of the uplands reflects the form of the stream-eroded Cretaceous bedrock, modified slightly by glacial erosion and by the deposition of a thin mantle of till. Landform at intermediate levels is determined largely by sediments which were deposited in proglacial lakes both preceding and following the last glaciation from the east. Since the draining of the last proglacial lake Peace River has cut a trench 700 feet deep below the lake floor and 150 to 250 feet below its interglacial channel. Lice from the Cordilleran area reached to within 15 miles of Fort St. John, overriding areas from which the early Wisconsin (?) eastern ice had already withdrawn. The Quaternary history here is important in localizing the few available aquifers for shallow farm wells, and may have significantly influenced migration of early man into central North America.