Mystery Amersham Craters – Anyone Know What they Are?

I have recently been sent the attached picture and map.  The picture shows 3 indentations in a field, which are in a line and look unnatural. I am wondering if anyone knows what they might be?

I don’t think they would be bomb craters from WW2, perhaps they are where clay was dug out ages ago.  They do seem to be a mystery, so if anyone knows, please let me know.

They are marked on the map, (they are across the valley from the A&W college).

 

fields1 map1

 

 

 

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