TNZ wrote:
"An explanation I read years ago about frozen mammoths suggestd they had been trapped in avalanches, fallen into snow drifts or through ice into bogs or lakes."

That explanation must be incorrect for the following reason. Some of those frozen mammoths were found with green grass in the mouths and plants from temperate climates in their stomachs. All of which are incompatible with any conceivable avalanche.

That said if you can find a reference to the explanation I'd like to review it.

DA Morgan