In article ,
Phil Gurr writes:
Merrivale Quarry on Dartmoor (Between Princeton and Tavistock) was filled to
the top with snow in 1963.
It was 160 feet deep and did not thaw completely until June of that year.

Phil
Marooned in Tavistock at that time

Thanks. That's very similar to the earlier case of Tavy Cleave (IIRC),
also on Dartmoor, which was also supposed to have been completely filled
and not to completely melt until June, I think after the Great Blizzard
of March, 1891. It's strange that the more recent instance doesn't seem
to be nearly as well-known as the earlier one.
--
John Hall
"The power of accurate observation is commonly called cynicism
by those who have not got it."
George Bernard Shaw