A biface knife, for instance, is completely chipped, flat, and often ovoid or bipointed in shape. The carefully chipped edges formed the working edge of the tool. An arrowhead or spear point is a specialized form of biface. No and no. It is a common misconception that archaeologists are only interested in Indian history.
Archaeologists are interested in the human story.
In North America, that involves both the Indian and the Euro-American cultures. In other parts of the world, archaeologists study the history of the people who lived there. As for dinosaurs, those studies are left in the capable hands of the paleontologists. Archaeologists are apt to use odd terms for common objects. One such is the term cache pit .