23 Jan 2003

Original list of 139 craters: courtesy of Dave Stephenson, Geodetic Survey of California.

• All structures should be confirmed as an impact structure by scientific methods. Clear indications are usually PDF's (shock metamorphosis), shatter cones and meteorite fragments.
• Diameter of an individual crater or impact pit must be over 5 meters for the list. This rules out most of holes produced by meteorite hitting the ground. Craters which diameter is 5 - 20 meters are usually a impact pits of a large meteorite(s). It is not easy to decide where the lower limit is. Probable 5 meter is not good, since small craters are easily destroyed and they are hard to identify, but I wanted that it is possible to add some new craters into the list too.  
• Confirmed big (>1 Mt in TNT)  airblast events like Tunguska are listed, even if they did not produce any craters at all.
• Name and coordinates of the structure must be known before it will be listed here.
• Diameters are often hard to determine. They should be rim to rim diameters but they are not always available due to erosion of structures. So diameters of large and old structures are usually diameters of remains of the crater. In many cases the diameter is a diameter of the geophysical anomalies.
• Most of crater fields are presented here by the largest crater. However, all craters which are over 1 km in diameter will be listed here even if they are not the biggest member of the crater field. More detailed list of most crater fields can be found in reference page.
• Bold names in  grey  cells indicates that pieces of impactor has been found. Pieces can be either a pieces of the meteorite or meteoritic spherules.
• Green text indicates structures added to the list lately and latest changes in data. However, a new structure in the list is not necessarily a new discovery.
• Red name in  pink cells  indicates that impact origin of the structure has caused some discussions lately. It usually indicates that I like to get more information about these structures. These are usually structures which confirmation is not rock solid but which has been thought to be an impact structure in some references. There is also some structures, which once were thought to be confirmed but which are now questionized. 
• Known date of impact is in  blue  cell. These are usually those small impact pits produced by large meteorites. 
• R-link (= references) opens a reference-page where you can find additional informations about structure. There is e.g. listed most of craters in crater fields. I will add as many literature reference as I manage to found.
• M-link (= more) opens my info page of structure in question.
• S-link (= special) opens my special page related to structure in question.
• P-link (= photos) opens my photo page where is some photos of the structure.