GeologyRocks

What an erratic question!!!

Seriously.   It sounds like it might be just that - what we call an erratic.

The ice sheet would firstly have planed the country rock 'flat' or at least smooth, and deposited the boulder which had been carried down in a glacier from a different area, and a different rock group. 

Where exactly is this?

John

“Civilisation exists by geological consent, subject to change without notice.” -  Will Durant

I have no idea where this may be. It is a question for a mountain leader course. I take it its isn't so common?

Thanks 

I'm sure John is right when he says it's a glacially-transported erratic.  This is supportedf by your saying it's for a mountain leader course as they tend to occur mainly in mountainous areas.  If you're from the UK there are many examples in Snowdonia, the Lake District, Pennines, Scotland, etc.  Quite often the flat polished "base" rock shows striations which indicate the direction of ice movement.  The rock resting on the top could be fairly local (such as the Norber Erratics in the Pennines) or it could have come a great distance -  there's an erratic on a beach in Cornwall that was transported by sea pack ice which originated in Norway!