Castletonking wrote:
> I pulled this beautifully preserved button out of the ground,near where i'm finding nothing but 18th an early 19th century items,
> no modern trash of any kind.not even a beer or soda can. Any idea what type of button it is,and i'm assuming its brass,but it
> came out of the ground,4 inches deep,as shiny as you see it.
It is that shiny because its brass body is heavily gold-plated. Notice that the brass loop on its back was not gold-plated, and thus shows typical brass oxidation.
You asked, "Any idea of what type it is?" The time is after midnight here in the US East Coast states, and I'm weary, so pardon me for answering your question with a cut-&-paste from one of my prior posts.
That specific form of button dates back to the 1700s ...but it is also still in use today, mainly on Military School cadet uniforms (such as the Virginia Military Institue cadets). That being said, the form of button you found was most-widely-used in the first half of the 1800s, and rapidly fell out of popularity afterwards, due to the advent of low-priced "more ornate" buttons.
Back in that earlier era, the specific form of button you found was called a ball-button or a bullet-button. It was frequently worn on civilian clothing, not just on military uniforms.
We diggers date that form of button by various small differences in the way it is constructed, such as its attachment-loop, and the Maker's-Mark (on buttons, it is called a backmark). Your photo of your ball-button's back seems to show it has no backmark to assist us in dating it. However, since you report finding "no modern trash" at the site, your goldplated ball-button is most probably associated with the time-period of the other relics you found at that site (late-1700s-to-early-1800s).
.Fortunately the rest of the family look after themselves and when they're not looking I go detecting 
