How Cold Was It?

Last week on the boardwalk I noticed footprints........frozen.

I believe these are formed when after a snowfall 

someone walks through the snow which compacts

under their weight.

Then the footprints freeze and the rest of the snow blows away

leaving the footprints intact.

Just another one of those interesting phenomenons that 

happens here in the Northern Hemisphere in winter.

These remind me of fossils which have been petrified.