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Your access to the NCBI website at gov has been temporarily blocked due to a possible misuse/abuse situation involving your site.This is not an indication of a security issue such as a virus or attack. Is this glass artificially vitrified (sharp quenching) or it becomes glassy at normal conditions (slow cooling)?

For Lake Puyehue, this approach has allowed particular sediment features to be related to the effects of the 1960 Chilean earthquake (Mw 9.5) on the lake basin and its catchment area.All of these layers affect the vertical distribution of radionuclides.The drawing up of accurate chronologies is made even more problematic by the low fallout rates of both natural (Am) radionuclides.Several cores were collected during the summer 2005 in different parts of the two selected peatlands.These minerotrophic patterned peatlands are presently affected by erosion processes, expressed by progressive mechanical destruction of their pools borders.

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