On a Nordic geological winter meeting in Oslo in January 2010 Adam Garde told about a possible impact structure in Greenland (see my post). He and co-authors have now published further findings in a paper in Earth and Planetary Science Letters of 1 July 2012.
(Sorry I have upload problems also with a map image, supposed to show up here - Hope to fix things later!)
The so far oldest (i.
A 100 kilometer-wide crater has been found in Greenland, the result of a massive asteroid or comet impact a billion years before any other known collision on Earth. The previously oldest known crater on Earth formed 2 billion years ... Read Post
Scientists in working in Western Greenland have found evidence of an asteroid or comet impact early in the Earth's history. At three billion years old, the crater is a billion years older than the previously oldest known crater. Read Post