Thanks all for the input. That was more info than I had. I'm really trying to scout the general area. Our subdivision is built on the site of an old rice plantation. (Not unusal around here.) I haven't been able to find much else to date the immediate area around where I found the Axe head. There is plenty of modern day trash around.
The site is close to a hwy cross roads and has been alternately farmed and forested for ever. So far that's the only identifiable piece of iron I have found. I do enjoy thinking about how it got there. I can't image anybody loosing what I imagine was such a valuable piece of equipment in its day.
The other hunks of iron and spikes I have found nearby haven't helped. I appreciate all the responses, I think I have as much fun prospecting on this website as I do in the field. That site that details the making of French Axe heads was especially interesting. I don't know the age but looking at it that is obviusly how it was put together. I guess its possible it was an old tool even when it got to this country.