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.
1" x 2 3/4 " x 1/4" at the base. It looks and feels fragile and I was amazed to find it in one piece standing on edge nestled between some other rocks in a very shallow creek.