Roter Kamm crater age: 3.5 to 4.0 Ma. Hartung, J. B. ; Kunk, M. R. ; Reimold, W. U. ; McG. Miller, R. ; Grieve, R. A. F. Abstract Publication: Meteoritics Pub Date: December 1991 Bibcode: 1991Metic..26R.342H