L. E. Craig

Palaeoproterozoic (1740 Ma) rift-related volcanism in the Hekla Sund region, eastern North Greenland: field occurrence, geochemistry and tectonic setting

B. Upton, S. Pedersen, H. Jepsen, 2002 .

Calibration of the geologic time scale: Cenozoic and Late Cretaceous glauconite and nonglauconite dates compared

R. Armstrong, Alan Smith, L. E. Craig, 1989 .