Dybkjær, Karen. 1991. “Palynological Zonation and Palynofacies Investigation of the Fjerritslev Formation (Lower Jurassic - Basal Middle Jurassic) in the Danish Subbasin”. Danmarks Geologiske Undersøgelse Serie A 30 (December). Copenhagen, Denmark:1-150. https://doi.org/10.34194/seriea.v30.7050.