Biostratigraphy of the Jurassic strata in the Dutch central North Sea Graben. (In: The Jurassic in the Southern Central Trough. O.Michelsen and N. Frandsen, editors)
Reference:
Herngreen,G.F.W. et al. (1991)
Biostratigraphy of the Jurassic strata in the Dutch central North Sea Graben. (In: The Jurassic in the Southern Central Trough. O.Michelsen and N. Frandsen, editors) Danmarks Geologiske Undersиgelse
# 16 P. 16- 16