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Estimating Age Of Rock Cairns In Southeast Alaska By Combining Evidence From Successional Metrics, Lichenometry, And Carbon Dating, Bruce Mccune,, Nijmah Ali,, Ralph J. Hartley, William J. Hunt Jr.

Department of Anthropology: Faculty Publications

We estimated ages of rock cairns in alpine tundra in southeast Alaska by combining information from three general classes of methods, each of them imperfect, but considered together providing better estimates than any of the three alone. We used lichenometry, radiocarbon dating, and five successional metrics: score on a nonmetric multidimensional scaling axis of vegetation composition, cover-weighted average successional class of organisms, overgrowth of contact points between rocks, sum of species cover, and species richness. Lichenometry estimated absolute ages, but with considerable error because we violated key assumptions. Successional metrics provided relative ages, probably with more precision than lichenometry, but …