Looks like a "foot" off of a piece of equipment.
It is the base to a raised pavement marker from the UK.
It is the base to a raised pavement marker from the UK. https://en.wikipedia.org/wiki/Raised_pavement_marker View attachment 1668508View attachment 1668509View attachment 1668510
I wonder how it got out in a field? Any roads nearby?
My initial guess would be that it was dug up and hauled away along with the dirt and debris during a road reconstruction project which was then dumped or used as fill dirt.