G.F.W. Herngreen, C. Hartkopf-Froder, and G.H.J. Ruegg, “Errata: Age and depositional environment of the Kuhfeld Beds (Lower Cretaceous) in the Alstatte Embayment (W Germany, E Netherlands), Geologie en Mijnbouw 72: 375-391, 1994.”, njg, vol. 73, p. 85, Jan. 1994.