Arrowhead hunting in Concord: flakes... maybe a hammer stone... and a plausible blade reconstruction

Chris's posts often make me go out arrowhead hunting, in shame I have not spent more time looking. With the new plowing and rain it definitely was time to go have a look. I found flakes, most of which were not too interesting after I picked them up:

 (quartz)

 (brown slate-like)

(blue argillite)

Chris commented that he had probably picked up and discarded several hammer stones. Here is a pretty good candidate from this same field- where there are no naturally occurring rocks.

If that is a hammer stone, maybe it was attached to a handle.

I went back the next weekend after more rain. Found more flakes:

 (a type of black rhyolite)

[When I picked up this little rock, it was the broken end of a larger piece. It would have been something long and thin. And in this same spot I have picked up other long thin pieces of black rhyolite, that I keep at home. Would there be a match???]

 (another type of black rhyolite)

I am told one kind of black rhyolite comes from Saugus and another from Westwood (it probably is not so simple). But this is clearly different material from the previous.

Here is most of some kind of scraper. Don't know the material but I have one complete Stark point made from it.

And here is a plausible blade reconstruction from when I got home.The tip on the right was sitting in a basket at home.

The flaking, edge work, material, and dimensions all match.