Great find! One word of advice would be to keep EVERYTHING you find, until you know what it is. You casually mentioned you found a military bitton. Well, MANY of the old "buttons" can be worth far more that many of the old coins. I doubt that this site has been hunted very much, or heavily, because a coin that size would be one of the first to be found. Keep going back, slow down and listed for the "whispers". If in doubt, dig it!
Here is a bit of advice to you, and anyone else that stumbles on a site like this. Keep everything that you find at a site like this together. Each item found will have a story to tell (with the exception of modern junk) if you do some research. These items may represent different time periods, and with a bit of research, you might be able to attach different families with the different items/time periods. As far as the button goes, was it Rev war, 1812 vintage, civil war, or a modern button from the 1900's? Maybe somewhere in between. As far as coins go, don't look at just the date, but the condition as well. If you were to find an 1838 dime for example, look at the condition. If it is in EF or AU condition, then it probably would have been lost within a year or 2 of the date. If the coin is in say VG condition, then you know that the coin had probably 20-30 years of circulation on it before it was lost.
Also draw a sketch of the property, with it showing large trees, foundations and any other signs of man-made objects. Mark the location down of where you are finding these items (and approx. depth), and this too might tell a story, or give you a better understanding of what was actually there 200 years ago. Doing all of this can add historical "value" to the item(s) you find. This can be very rewarding to those who view these items many years from now. Don't do this on just the good items you find, but on the junk items as well. Agian, I am not referring to any modern junk like pull tabes, bottle caps etc.
After you are through with hunting this site, you can assemble a nice display of the various items you have excavated, and with the recovery info you made, makes the items even more interesting in a historical sense.
