I agree with GD and Seldom. Hunting in the deserts of Arizona, the ground is so hard most of the year that you need a pick or a jackhammer. We have a few very short periods when the ground is either soft or "flash floods" move both metal and soil to a new location, burying the metal in the process. The end result of all this is when we're hunting sites away from population centers, most finds are either on the surface or very close to it (7.5 cm or less in depth) even if the find is 160+ years old---unless we are hunting in "washes" or "ravines" where we can expect finds to be much deeper. The exception to the rule is areas where cultivation artificially disturbs the soil -- both pushing artifacts down and then pulling them back up again.
I suspect that the Russian cold would have a similar effect to the Arizona heat.
BA
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