How large is the circumference ??
I have found that most areas have been logged or cut down many,,MANY times in the past 200 years.
Firewood,,,lumber,,,fuel for old smelting operations,,farming, whatever.
Very few,, if any of the "sign" trees are around,,, especially where I live and quite probably where you are now.
If you "feel" something MAY be buried or hidden there I would look for other clues,, as in rock piles, cairns,,shaped rocks or groupings that may pont you in the right direction.
BUT,,,,
If you were in the west,,, the deserts or mountains there are cacti and even old dead trees that are real markers,, even still.
Be aware of anything that may not be a natural formation,, I would begin there.