| coal for coal sake | destroying the mountains | 5/13/13 |
| Meteor Crater? | ProfFrink | 5/8/13 |
| Impact Craters? | Rick Raymond | 5/7/13 |
| Medical Geology (emerging discipline) | Skidmore College | 5/6/13 |
| Old lime rock quarry | Real Jeep | 4/30/13 |
| Possible impact crater in Mali? (second attempt) | Death by SCIENCE | 4/30/13 |
| Possible impact crater in Mali? | Death by SCIENCE | 4/30/13 |
| Meteor Impact sites in Australia | neotautis | 4/29/13 |
| Meteor impact structure in glacier? | James Norris | 4/26/13 |
| Geological map of Afghanistan | Eqrar | 4/24/13 |
| Crater in southern Egypt? | ABlakeney | 4/22/13 |
| Daisetta TX Sinkhole | jonola68 | 4/21/13 |
| Strange Shape In Sahara Geology | Blobbert | 4/21/13 |
| Impact crater | YuriyY | 4/21/13 |
| Posible Impacto de Meteorito. | Kaszlo75 | 4/21/13 |
| Dam cause of 2008 Sichuan quake ? | (unknown) | 4/21/13 |
| impact crater? | ABlakeney | 4/20/13 |
| Meteoritic impact | hberaldi | 4/6/13 |
| Kilbourne Hole (Maar - Volcanic Explosion) | Cuban Pete | 4/2/13 |