Stone Axes / celts / plows / tomahawks are pretty rare items from other than East Tx. Best bet to get a proper opinion on that find is take it to an
artifact show where there are many professional dealers to ask.
Luling March 9th....Fredericksburg March 30th.
Here's a link to a website that may or may not be helpful Mr. Hughes. They were very useful appraising the Celt stones I found in central texas http://www.artifactgrading.com/appraisals.htm