----------------------------Original message---------------------------- Thank you for the reply I'm interested in reading the book. I'm an amateur archaeologists with absolutely no credentials just an interest. I located several unusual rock formations that outline a piece of property in Massachusetts. My hypothesis so far based upon my research is that these unusual stone structures (perched boulders) were constructed by native americans and the site that these boulders mark has some significance to native americans. The possibility exists that these perced boulders were set and balanced by colonial surveyors who were marking the landscape. I'm looking for refernces as to how the colonial surveyors marked the landscape during their surveys. I'm hoping that they DID NOT have a practice of setting large boulders to mark the landscape. I am also hoping that I can find refernces to colonial surveyors using existing "perched boulder" or "large rocks as refence points during their surveys which would suggest that these boulders existed before they did the surveys and that they may have had some significance to the people who occupied the land - native amercicans. Thks Bob Cerra Its interesting that you mention swamps The literature regarding Massachusetts strongly indicates that swamps were an important place to Native americans in the 1600's. Either the swamp was easy to defend or easy to hid in -