That's called a biface. An unfinished piece...a blank. I'd guess it was discarded because of the cortex material on one side toward the tip. If he got rid of the cortex, the thing would have probably been too short for what he was wanting to make. If he finished it like that, the cortex would not be sharp enough to do the job. Reject bifaces are common at quarry sites. Perfect ones are less common because they didn't get pitched. Are you near the James River? The material looks like that stuff. Gary
You posted this thread twice...I unfortunately posted on the other duplicate...anyhow, I think its possibly a skinner/scrapper or just a discard like they stated above.