In one paper, it and some other recently proposed impact structures are described as being "dubious."

If this is an impact structure, the strata within the center of it would not be flat lying.

It is most likely the largest impact structure in South America.

Although they looked like they may have been caused by a meteor, he had no experience of impact structures.

There are now well Over a hundred such impact structures claimed on earth.

There are some other suggested impact structures which are larger.

It has been described from many of the larger impact structures identified on earth.

Oil exploration led to the discovery of a possible buried impact structure in the sediments under the island.

The current publications do not list a more precise location for the impact structure than the island.

This led to the suggestion that Avak might be an impact structure.