| 1 | Stone implements included adze, arrowhead and grinder. | |
| 2 | "Shooting an arrow to a stone and the arrowhead into the stone" there is big possibility; 4. | |
| 3 | One such place, in fact, is a short drive from Los Angeles, in San Bernardino county: Lake Arrowhead, California. | |
| 4 | Arrowheads with Flat-tip are a common type found from tombs of Eastern Zhou dynasty. However, it remains uncertain of its names, dates, and functions. |