That form sure does look Scottsbluff. Although not typical, I have seen many cultures try to save time and make knives from a large spall. You can't blame them, it just saved them alot of time in the thinning process. They were after function over form. I have a few examples of old paleo forms that are made from a large spall, not bifacially flaked to the center on both sides. I enjoy them and they sure make for good conversation.