Looks like you are in an area where all they had to work with is quartzite, in this photo top line 2nd from right looks like the base of a perform that was being made into a blade. some of the other pieces have flaking scars on them where they did not work out.
Welcome to the forum! I search a creek on my property and find similar and I almost always bring them back. Have you found anything else in the creek such as pottery shards or projectile points? Keep hunting though because if it's like my creek you will find some awesome stuff in it.