Dam, Gregers, Henrik Nøhr-Hansen, Flemming G. Christiansen, Jørgen A. Bojesen-Koefoed, and Troels Laier. 1998. “The Oldest Marine Cretaceous Sediments in West Greenland (Umiivik-1 Borehole) – Record of the Cenomanian–Turonian Anoxic Event?”. Geology of Greenland Survey Bulletin 180 (December):128-37. https://doi.org/10.34194/ggub.v180.5096.