| Kamensk crater | |
|---|---|
 Landsat image of Kamensk crater | |
| Impact crater/structure | |
| Confidence | Confirmed |
| Diameter | 25 km (16 mi) |
| Age | 49.0 ± 0.2 Ma Eocene |
| Exposed | No |
| Drilled | Yes |
| Location | |
| Coordinates | 48°21′N 40°30′E / 48.350°N 40.500°E |
| Country | Russia |
| State | Rostov |
| Municipality | Kamensk-Shakhtinsky |
  Location of the crater in Russia | |
Kamensk crater is an impact crater located 10 to 15 kilometres (6.2 to 9.3 mi) to the south of Kamensk-Shakhtinsky town in Rostov Oblast, Russia. It is 25 km (16 mi) in diameter and the age is estimated to be 49.0 ± 0.2 million years old (Eocene). The crater is not exposed at the surface.[1] It may have formed at the same time as the smaller and nearby Gusev crater.
Six laser total-fusion analyses of the Kamensk impact glass have a weighted-mean age of 49.2 ± 0.1 Ma relative to sanidine from the Taylor Creek Rhyolite of New Mexico, that has an age of 27.92 Ma relative to a K-Ar age of 162.9 ± 0 Ma for a primary fluence-monitor standard SB-3 biotite or of 513.9 Ma for an international hornblende standard MMhb-1. This isotopic age of the Kamensk glass recalculated using a reference age for MMhb-1 of 520.4 Ma is 49.9 ± 0.1 Ma.[2]
