Sorry I missed your other point to the right of the larger rock. It is quite possible that the larger rock could be "fire-rock" from an old indian camp fire. As others have said, if the points were found it the vicinity it would be a good area to look. Most people don't realize that the indians actually heated the harder granite like rocks on the coals. Then they put these heated rocks into containers made of heavy rawhide ( buffalo ) to heat up and cook their foods. Just trying to help, I"ve been in your shoes before. I'm not trying to discourage you from hunting arrowheads. When I was a lot younger I found what I thought was an artifact, but it was just what I or we call a leave-r-rite "there" rock. Thanks for understanding! Old digger.