[blam]

Do you have a date on that crater? We have the one linked below in Iraq at about 2200BC. Maybe a swarm?

Disaster That Struck The Ancients

[SunkenCiv]

Only 150 years ago.

http://www.freerepublic.com/focus/news/1882826/posts?page=13#13

[Fred Nerks]

http://www.saudiaramcoworld.com/issue/200602/volcanic.arabia.htm

Al-Wahbah crater, nearly two kilometers (1.2 mi) wide, is a maar crater, formed not by volcanic eruption but by the collision of rising volcanic material with an underground body of water, resulting in a colossal release of steam—an event geologists call a phreatic explosion...

this aramcoworld article shows location also. Impact site? Now doubtful. Never heard of a phreatic explosion, have you?