| Ventifacts are produced under arid conditions and are generally formed from hard, fine-grained rocks such as obsidian, chert, or quartzite. |
| During intervening dry periods, winds scour the fan surfaces and sandblast exposed gravel clasts to produce smooth faceted ventifacts. |
| Five-sided symmetrical ventifacts or yardangs appear to be totally nonexistent on Earth and Mars. |
| In reality, their makers are definitely of this land, for it is the wind and sand that have formed these strange offerings, called ventifacts. |
| The occurrence of ventifacts and frost fissures implies a cold, windy periglacial climate. |
