The Hamlet Project

What is this style of burial?
Now, I’m pretty sure, most people are buried with the stone at their heads and the grass-green turf down to their heels. That’s why it’s called a headstone. But were people once buried the other way round? Or is there some style of burial or tradition or religious reason to put a stone at someone’s feet? Is it, like, murder victims get a footstone rather than a headstone? Or those who are quickly buried? Heads of state? Is there some layer of meaning in this stone placement?