The downvalley extent of Pinedale glaciers in the Mosquito Range on the east side of the Arkansas Valley is uncertain: most likely, Pinedale glaciers were almost as extensive as Bull Lake glaciers but built no prominent terminal moraines at their maximum positions.
The method was developed by Willard Libby in the late 1940s and soon became a standard tool for archaeologists.
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Near Twin Lakes, indices for soils on low, outer lateral moraines suggest that the older Pinedale glaciers extended beyond the margin of high, younger Pinedale lateral moraines with hummocky topography.
A few subdued moraines near Twin Lakes and Leadville probably record one or more glaciations significantly older than the Bull Lake.
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Discussion of possible soil organic matter turnover mechanisms leads to a theory of rates of decomposition high in the initial stages and slowing down to nearly zero with time.
Application of14C techniques to humus dynamics until now yielded apparently contradictory results on relative ages of different humic matter fractions., Enrichment of old material in the HCl hydrolysis residue fraction, however, has been observed in all instances.Bacteria don’t mate the way most animals do, by combining genomes wholesale through a union of egg and sperm.Instead, they may swap one or a handful of genes on small circles of DNA called plasmids through docking tunnels between bacteria (a process called conjugation).In case of fossil soils, minimum age is maximum estimate for period of burial.The gap existing between minimum age and true age can be reduced by special techniques of fractionation, as well as by taking account of additional pedological information on turnover features of the material.Libby received the Nobel Prize in Chemistry for his work in 1960.