Lets look at the choice of words...

We need something to describe the sites that need protection..

Descriptors:

Ancient
Stones
Heritage
Culture
Sacred
Sites

and something that describes the action to be taken...

Action points:

Care
Preservation
Protection
Action

And possibly a description of the organisation...

Group
Collective
Trust (if applicable)

eg... Ancient Heritage Protection Group etc.

Or, go for something a little less long winded and more abstract...

First Light, Stone Watch, Sun Dial, Stone Light, Gnomon...

I can also sort quite cheap printing on stationery if needed.