1.   For example, many early human artifacts, such as arrowheads, are made of obsidian, a volcanic glass.

2.   But Waters said that a pile of quartz flakes found near some of the tools indicated that these were indeed human artifacts.

3.   Native American volunteers and archeologists have already combed the basin for human artifacts.

4.   Other holes, all of which are about three feet in diameter, contain clothes and other human artifacts.

5.   The canal is a human artifact, but Chase Prairie has probably been the way it is for thousands of years.

6.   They found human artifacts like an old brass shell casing from Korean War days, when the Air Force used the woods for target practice.

7.   Native American volunteers and archaeologists also have combed the basin for human artifacts.