Geology of Vredefort impact structure (IMAGE) American Geophysical Union Caption Impact craters and their broader structures can be visible in a geologic map, like a bullseye. But what geophysical traces remain at the structure’s outermost edges? Credit Huber et al. (2023), Journal of Geophysical Research: Planets Usage Restrictions Credit must be given to the creator. License CC BY Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.