A good day in coastal Rhode Island

Chris Pittman was kind enough to share some of the sites he has located. Locating the sites is the hard part. Looking straight down at the ground is the easy part and I had a good day. Nonetheless I feel that these are really his arrowheads:

He calls the material of the upper right, stemmed point "Attleboro Rhyolite". I call it, more vaguely, "Wamsutta Formation". 

The quartz triangles are very common in this area, and I was wondering if triangles aren't the easiest thing to make from a crystal with hexagonal cleavage.