"Minor" Crater Caused by a Small Asteroid

The crater shown in this photograph is called the Barringer crater located in Arizona.  It was the result of an impact by a 50-meter asteroid, 50,000 years ago.  The size of the crater is 1.2 km (3/4 mile).  

There are at least 44 impact craters over 20 km in diameter, but they are not as visible as the Barringer crater because they are much older.  The Chicxulub crater in the Yukatan peninsula  is 180 km in diameter, and there is a 250 km crater in Canada and a 300 km crater in South Africa.   A meteor caused a 100 km crater in Russia is also suspected to have caused the Eocene–Oligocene extinction event, 35 million years ago.

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Because 70% of the Earth's surface is covered by the ocean, it is more than twice as likely that asteroid strikes the ocean than land.  When did it happen?

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