Tracking Environmental Change Using Lake Sediments: Basin by William M. Last, John P. Smol

By William M. Last, John P. Smol

William M. Last is a professor within the division of Geological Sciences at college of Manitoba (Canada) and is co-editor of the Journal of Paleolimnology. John P. Smol is a professor within the Biology division at Queen's collage (Canada), with a cross-appointment on the college of Environmental stories. He co-directs the Paleoecological Environmental evaluate and learn Lab (PEARL). Professor Smol is co-editor of the Journal of Paleolimnology and holds the Canada examine Chair inEnvironmental Change.

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By William M. Last, John P. Smol

William M. Last is a professor within the division of Geological Sciences at college of Manitoba (Canada) and is co-editor of the Journal of Paleolimnology. John P. Smol is a professor within the Biology division at Queen's collage (Canada), with a cross-appointment on the college of Environmental stories. He co-directs the Paleoecological Environmental evaluate and learn Lab (PEARL). Professor Smol is co-editor of the Journal of Paleolimnology and holds the Canada examine Chair inEnvironmental Change.

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1988; Morey, 1974; 1976; Osumi & Ueno, 1988). Some work was done on measuring the depth of shallow water (Austin & Austin, 1974; Ulriksen, 1982); however, the study of glaciers and ice caps, salt, coal, and hard rock mines dominated this early work with GPR. The third stage of development was issued in with the development of the first commercial analog GPR system (Lerner, 1974). In the 1970’s the activity level dramatically increased, with a variety of applications identified. However, the moderate system performance of early commercial systems and the lack of digital data processing capabilities limited their utility.

J. Golmstok, L. P. Zonenshain, T. C. Moore, C. A. Scholz & K. D. Klitgord, 1992. Depositional and tectonic framework of the rift basins of Lake Baikal from multichannel seismic data. Geology 20: 589–592. Lezzar, K. -J. Tiercelin, M. De Baptist, A. S. Cohen, T. Bandora, P. Van Rensbergen, C. Le Turdu, W. Mifundi & J. Klerx, 1996. New seismic stratigraphy and late-tertiary history of the north Tanganyika basin, East African Rift system, deduced from multichannel and high-resolution reflection seismic data and piston core evidence.

The stratigraphic analysis of seismic reflection profiles uses the characterization of stratal relationships, in the form of reflection terminations, to identify breaks and changes in the sedimentary record of a basin. Principal stratal relationships and their importance in deciphering basin histories are described in Table I, and can also be applied to basin studies in lacustrine basins, as is demonstrated in Figures 2–4. Several assumptions are made in seismic stratigraphic analysis. Foremost among these is that seismic reflections have chronostratigraphic significance, and that discrete reflections represent time lines from which relative stratigraphic and structural histories within the basin can be derived.

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