Ring Structures ( Possible Impact Craters ?????) in Shortanbay area of North Caspian

For some brief speculation, without any supporting data, about 
possible impact craters in the Caspian Sea area, go look at:

Ring Structures of North Caspian - Possible Hydrocarbon 
Reservoirs Internet Geology News Letter No. 145, April 15, 2002
http://reocities.com/ResearchTriangle/campus/5317/L145a.html

"Seismic surveys in the Shortanbay area in the south of the North 
Caspian depression have disclosed several ring structures, which 
are interpreted as buried craters of possible meteorite impact
origin."

Another "ring structure" is discussed in:

Ring Structure in Basement of South Tatar arch
Internet Geology News Letter No. 126, December 3, 2001
http://reocities.com/ResearchTriangle/campus/5317/L126a.html

Yours,

Paul H.