I dont know. What I saw in Sept. '05 is shown above (me & cooperative) and a general view of the very high valleys, which today are quite temperate and fertile. In fact it is a dairy farming area and the main agricultural activity of the Quechwa people I lectured to is irrigated pasture for dairy cattle. As seen in contemporary pictures, there is pretty little ice cap left. In the two illustrations by Humbold and Bonpland we see what they saw some 350 years ago. The volcano is younger, and it has a pointy end, which has eroded and collapsed. The upper conus is completely covered by thick ice, and this cover gets less and less thick at lower altitudes. Earth's climate was also colder during his time, but that is what we are wondering about.
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