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Geological Survey Reconstructed Trends National Synthesis study collected sediment cores from 56 lakes and reservoirs between 19 across the United States.The primary objective of the study was to determine trends in particle-associated contaminants in response to urbanization; 47 of the 56 lakes are in or near one of 20 U. Chemical analyses included major and trace elements, organochlorine pesticides, polychlorinated biphenyls, polycyclic aromatic hydrocarbons, cesium-137, and lead-210. Applications are in the areas of Late Quaternary geochronology, sedimentology and biochronology.Please discuss your proposal with the appropriate ANSTO Contact Scientist before submitting your proposal as they will assist you in making the correct capability selection.

Dates were assigned in many cores on the basis of assumed constant mass accumulation between known depth-date markers.

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Dates assigned were supported using a variety of other date markers including first occurrence and peak concentrations of DDT and polychlorinated biphenyls and peak concentration of lead.

A qualitative rating was assigned to each core on the basis of professional judgment to indicate the reliability of age assignments.

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