This is a cool tool. It has the most excellent patina. The material has fossil shells embedded throughout it. It is hard to show them in the photos. The large divots are not chips in the material, they are the shells.
This is a large flaked tool. I don’t believe it was a spade or hoe as it is absent of smoothing caused by digging in soil. It would have made a great hide scraper or cutting tool. It has fine pressure flaking on it’s cutting edge