Agreed, a "chopper" . That covers a lot of ground like being used for a scraper or preform for a blade or a "trade blank ",
The Austin area was a beehive of older po****tions so it could be from 10,000 yrs BP to about 200 BP The design of such a tool was unchanged over the yrs.
How it found it's home in a young tree is just fun to speculate on.
CAUTION...further research into this indian artifact could lead to serious flint addiction