Think it's a repeat, the Formby footprints are (were?) fascinating. Apart from humans there are also aurochs, deer etc
They got a retired chiropodist to study some and, from the prints alone, she deduced that one individual was a heavily pregnant 14 year old girl.
They're just in the mud so they're exposed and then wash away. 10,000 years under a sand dune and then; paff! gone!