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This major study reflects the increasing significance of careful model formation and testing in those academic subjects that are struggling from intuitive and aesthetic obscurantism toward a more disciplined and integrated approach to their fields of study. The twenty-six original contributions represent the carefully selected work of progressive archaeologists around the world, covering the use of models on archaeological material of all kinds and from all periods from Palaeolithic to Medieval. Their common theme is archaeological generalisation by means of explicit model building, testing, modification and reapplication. The contributors seek to show that it is the use of certain models in particular ways that defines archaeology as the practice of one discipline, with a set of general tenets that are as applicable in Peru as in Persia, Australia as Alaska, Sweden as Scotland, on material from the second millennium B.C. to the second millennium A.D. They assert that careful model formulation within archaeology and the cautious exchange and testing of models within and beyond the discipline provides the only route to the formation of the common, internationally valid body of theory which defines a vigorous and coherent discipline and distinguishes it from being a collection of merely regionally applicable special cases.
This study describes the petroleum geology of Triassic exploration plays; provides an assessment of remaining natural gas potential; gives an economic analysis using information from exploration results; and applies an investment decision methodology to estimate the quantity of economically recoverable resources. The study is largely confined to the Peace River Arch/Embayment area and excludes Foothills structural plays.
This book reviews advances in understanding of the past ca. two million years of Earth history - the Quaternary Period - in the United States. It begins with sections on ice and water - as glaciers, permafrost, oceans, rivers, lakes, and aquifers. Six chapters are devoted to the high-latitude Pleistocene ice sheets, to mountain glaciations of the western United States, and to permafrost studies. Other chapters discuss ice-age lakes, caves, sea-level fluctuations, and riverine landscapes. With a chapter on landscape evolution models, the book turns to essays on geologic processes. Two chapters discuss soils and their responses to climate, and wind-blown sediments. Two more describe volcanoes and earthquakes, and the use of Quaternary geology to understand the hazards they pose. The next part of the book is on plants and animals. Five chapters consider the Quaternary history of vegetation in the United States. Other chapters treat forcing functions and vegetation response at different spatial and temporal scales, the role of fire as a catalyst of vegetation change during rapid climate shifts, and the use of tree rings in inferring age and past hydroclimatic conditions. Three chapters address vertebrate paleontology and the extinctions of large mammals at the end of the last glaciation, beetle assemblages and the inferences they permit about past conditions, and the peopling of North America. A final chapter addresses the numerical modeling of Quaternary climates, and the role paleoclimatic studies and climatic modeling has in predicting future response of the Earth's climate system to the changes we have wrought.