Kamensk crater
Encyclopedia
Kamensk is an impact crater
Impact crater
In the broadest sense, the term impact crater can be applied to any depression, natural or manmade, resulting from the high velocity impact of a projectile with a larger body...

 in Russia.

It is 25 km (15.5 mi) in diameter and the age is estimated to be 49.0 ± 0.2 million years old (Eocene
Eocene
The Eocene Epoch, lasting from about 56 to 34 million years ago , is a major division of the geologic timescale and the second epoch of the Paleogene Period in the Cenozoic Era. The Eocene spans the time from the end of the Palaeocene Epoch to the beginning of the Oligocene Epoch. The start of the...

). The crater is not exposed at the surface. It may have formed at the same time as the smaller nearby crater Gusev
Gusev crater (Russia)
Gusev is an impact crater in Russia. It is located near Kamensk-Shakhtinsky in Rostov Oblast.The crater is 3 km in diameter and its age is estimated to be 49.0 ± 0.2 million years old placing it in the Eocene. The crater is not exposed at the surface. It may have formed at the same time as nearby...

.
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