| Logoisk crater | |
| Map: | Belarus |
| Coordinates: | 54.2°N 75°W |
| Confidence: | Confirmed |
| Diameter: | 15km (09miles) |
| Age: | Middle Eocene 42.3 ± 1.1 Ma |
| Exposed: | No |
| Drilled: | Yes |
| Country: | Belarus |
| Municipality: | Lahojsk |
Logoisk crater or Logoisk astrobleme is a meteorite impact crater in Belarus near the city of Lahoysk.
It is 15km (09miles) in diameter and is estimated to be 42.3 ± 1.1 million years old (Eocene). The crater is not exposed at the surface.[1]
The crater was discovered by an accident during a routine exploration drilling near the village of in 1970s. A section was discovered with atypical materials in an unusual sequence: Quaternary deposits up to depth of 160m followed by a 230 meter thick layer of layered clays and lacustrine sediments followed by 240 meters of breccias, rocks previously unseen in the geology of Belarus. Three more drills made in 1976-1977 provided a clear evidence of the meteorite origin of the anomaly. Subsequent drillings mapped the crater.[2] During the period of intensive research it was suggested that the crater may contain diamonds formed due high temperature and pressure of the impact, but there has been no confirmation.[3]