Looks like an Osceola and a darn nice one. I have about 4 that are nearly identical. Often times they get a little asymmetrical from resharpening. They are dated to the middle to late Archaic period. At a site in Muscatine County, Iowa they were found in association with 1/2 grooved axes and dated to about 5500 BP. Most of the time when you find those type points in fields you'll find axes with them.
Hippy