Fig. 7

a Cumulative totals of Tibito Tephra thickness for valley floor, erosional slopes, and slope crest geomorphic environments in the Western Finisterres. Median thicknesses for crest environments lie between those for erosional and depositional environments. Note that Tibito Tephra was absent from 20% of the erosional slope sample cores, 12% of the crest sample cores, and 5% of the valley floor cores; b Cumulative thicknesses and mean thicknesses of Tibito Tephra in non-tussock grassland and herbfield (waterlogged) sites, tussock grassland (wet) sites, and shrubland (well-drained) slopes; c Depth of burial of the surface of Tibito Tephra recorded in alpine grasslands at elevations around 3600 m above sea level. Cumulative rates of burial for valley floor, erosional slope, and slope crest geomorphic environments are shown. The survey was conducted about 330 years after deposition of Tibito Tephra